Addition & Subtraction

52 Skills in Mathematics. 52 are ready to try — three verified questions each, no account needed.

Ready to try

Ages 4–6
Addition and subtraction word problems
Solve addition and subtraction word problems within 10 using objects or drawings
16 verified questions on this shelf
Ages 4–6
Addition as combining or putting together two
Understand addition as combining or putting together two groups to find the total
10 verified questions on this shelf
Ages 4–6
Number bonds to 9
Find the number that makes 10 when added to a given number from 1 to 9 (number bonds to 10)
12 verified questions on this shelf
Ages 4–6
Numbers up to 10 into pairs
Decompose numbers up to 10 into pairs in more than one way (part-part-whole)
17 verified questions on this shelf
Ages 4–6
Representing Addition and Subtraction
Represent addition and subtraction using objects, drawings, and mental images
23 verified questions on this shelf
Ages 4–6
Subtraction as taking away or separating
Understand subtraction as taking away or separating from a group to find how many remain
10 verified questions on this shelf
Ages 5–6
Adding and subtracting
Add and subtract one-digit and two-digit numbers to 20, including zero
10 verified questions on this shelf
Ages 5–7
Early Word Problems
Solve one-step word problems involving addition and subtraction to 20, including missing-number problems
13 verified questions on this shelf
Ages 5–6
Fluent adding and subtracting within 5
Fluently add and subtract within 5
12 verified questions on this shelf
Ages 5–6
Number bonds
Recall number bonds (addition and related subtraction facts) within 20
10 verified questions on this shelf
Ages 5–6
Reading +, −, and = symbols
Read, write, and interpret the symbols +, −, and = in number sentences
36 verified questions on this shelf
Ages 6–7
Adding and subtracting tens mentally
Add and subtract a two-digit number and tens mentally and using concrete/pictorial representations
9 verified questions on this shelf
Ages 6–7
Adding Three Small Numbers
Add three one-digit numbers using strategies including looking for pairs that make 10
10 verified questions on this shelf
Ages 6–7
Adding two two-digit numbers
Add and subtract two two-digit numbers using concrete objects, pictorial representations, and mental methods
10 verified questions on this shelf
Ages 6–7
Adding within 100
Add within 100 using strategies based on place value, including adding a two-digit and one-digit number, and a two-digit and a multiple of 10
15 verified questions on this shelf
Ages 6–7
Addition and subtraction strategies
Use counting on and counting back as strategies for addition and subtraction
10 verified questions on this shelf
Ages 6–7
Addition and subtraction within 20
Add and subtract within 20 using strategies such as making ten, decomposing a number leading to ten, and using known facts
40 verified questions on this shelf
Ages 6–7
Addition in any order
Understand and apply the commutative property of addition: addends can be added in any order
27 verified questions on this shelf
Ages 6–7
Finding a missing number in addition
Understand subtraction as finding an unknown addend (e.g. 10 − 8 = ? is the same as 8 + ? = 10)
16 verified questions on this shelf
Ages 6–7
Fluent adding and subtracting within 10
Fluently add and subtract within 10
13 verified questions on this shelf
Ages 6–7
Fluent addition and subtraction
Recall and use addition and subtraction facts to 20 fluently, and derive and use related facts up to 100
13 verified questions on this shelf
Ages 6–7
Grouping numbers to add
Understand and apply the associative property of addition: when adding three numbers, any two can be added first
12 verified questions on this shelf
Ages 6–7
Inverse: addition undoes subtraction
Recognise and use the inverse relationship between addition and subtraction to check calculations and solve missing-number problems
11 verified questions on this shelf
Ages 6–7
Mental addition and subtraction (age 6+)
Add and subtract a two-digit number and ones mentally and using concrete/pictorial representations
10 verified questions on this shelf
Ages 6–7
Mental and written addition and subtraction
Solve addition and subtraction problems using mental and written methods, including problems involving numbers, quantities, and measures
10 verified questions on this shelf
Ages 6–7
Subtracting multiples of 10
Subtract multiples of 10 (10–90) from multiples of 10 using place value strategies
11 verified questions on this shelf
Ages 6–7
Unknown in Addition & Subtraction
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers
12 verified questions on this shelf
Ages 6–7
What the equals sign means
Understand the meaning of the equal sign as 'is the same as' and determine if equations are true or false
10 verified questions on this shelf
Ages 7–8
Adding and subtracting (age 7+)
Add and subtract numbers with up to three digits using formal written methods of columnar addition and subtraction
10 verified questions on this shelf
Ages 7–8
Adding numbers
Add up to four two-digit numbers using strategies based on place value and properties of operations
10 verified questions on this shelf
Ages 7–8
Addition and subtraction strategies (age 7+)
Explain why addition and subtraction strategies work, using place value and the properties of operations
19 verified questions on this shelf
Ages 7–8
Addition and subtraction within 1000
Add and subtract within 1000 using concrete models, drawings, and strategies based on place value; understand composing and decomposing tens and hundreds
13 verified questions on this shelf
Ages 7–9
Estimating by rounding
Estimate the answer to a calculation and use inverse operations to check answers; apply to increasingly large numbers using rounding and inverse reasoning
10 verified questions on this shelf
Ages 7–8
Fluent adding and subtracting within 100
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and the relationship between addition and subtraction
30 verified questions on this shelf
Ages 7–8
Fluent adding and subtracting within 20
Fluently add and subtract within 20 using mental strategies; know from memory all sums of two one-digit numbers
13 verified questions on this shelf
Ages 7–8
Mental addition and subtraction (age 7+)
Mentally add and subtract a three-digit number and ones
10 verified questions on this shelf
Ages 7–8
Mentally adding hundreds to 3-digit numbers
Mentally add and subtract a three-digit number and hundreds
10 verified questions on this shelf
Ages 7–8
Mentally adding tens to 3-digit numbers
Mentally add and subtract a three-digit number and tens
10 verified questions on this shelf
Ages 7–8
Missing number problems (age 7+)
Solve addition and subtraction problems including missing-number problems, using number facts, place value, and more complex methods
10 verified questions on this shelf
Ages 7–8
Numbers on a number line
Represent whole numbers as lengths on a number line and represent sums and differences within 100 on a number line diagram
13 verified questions on this shelf
Ages 7–8
Two-Step Word Problems
Solve one- and two-step word problems within 100 using addition and subtraction, with unknowns in all positions
31 verified questions on this shelf
Ages 8–9
Adding and subtracting (age 8+)
Add and subtract numbers with up to four digits using formal written methods of columnar addition and subtraction
10 verified questions on this shelf
Ages 8–9
Fluent adding and subtracting within 1000
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and the relationship between addition and subtraction
13 verified questions on this shelf
Ages 8–9
Two-step addition and subtraction problems
Solve addition and subtraction two-step problems in contexts, deciding which operations and methods to use and why
11 verified questions on this shelf
Ages 8–9
Two-Step Equations
Solve two-step word problems using the four operations; represent problems using equations with a letter standing for the unknown quantity
15 verified questions on this shelf
Ages 9–10
Adding and subtracting (age 9+)
Solve addition and subtraction multi-step problems in contexts, deciding which operations and methods to use and why
12 verified questions on this shelf
Ages 9–10
Checking Answers by Rounding
Use rounding to check answers to calculations and determine appropriate levels of accuracy in context
9 verified questions on this shelf
Ages 9–10
Fluent addition and subtraction (age 9+)
Fluently add and subtract whole numbers with more than four digits using the standard columnar algorithm
9 verified questions on this shelf
Ages 9–10
Mental addition and subtraction (age 9+)
Add and subtract numbers mentally with increasingly large numbers, using place-value knowledge and derived facts
9 verified questions on this shelf
Ages 10–11
Adding and subtracting (age 10+)
Solve addition and subtraction multi-step problems in contexts, deciding which operations and methods to use and why, with numbers up to 10,000,000 and decimals
10 verified questions on this shelf
Ages 10–11
Addition and subtraction strategies (age 10+)
Add and subtract decimals to hundredths using strategies based on place value, properties of operations, and the relationship between addition and subtraction; relate strategies to written methods and explain reasoning
10 verified questions on this shelf
Ages 11–13
Positive and Negative Numbers
Understand positive and negative numbers as describing quantities with opposite directions or values; use them in context such as temperature, floors in a building, and bank balances
17 verified questions on this shelf

Skill names and descriptions include the Marble Skill Taxonomy © Generative Spark, Inc. (withmarble.com), licensed under ODbL 1.0 (database) and CC BY-SA 4.0 (content). Practice questions are GlowGrades's own, each checked by independent verifiers that must agree before a child ever sees it.