Ages 7–8🧮 Mathematics8 verified questions on this shelf

Choosing the right strategy

Select and use appropriate tools and representations strategically, including choosing between mental methods, jottings, formal algorithms, and calculators for arithmetic with multi-digit numbers, decimals, and fractions

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Question 1 of 3

Noah is helping with the school bake‑sale. He needs to find two totals: 1) the cupcakes sold so far, 640 + 150, and 2) the cookies sold so far, 487 + 326. He wants to solve one total in his head and write the other using the standard column method. Which pair of choices will let him finish the calculations fastest?

Question 2 of 3

Sam wants to add two numbers. He will solve one problem in his head and write the other one down in column form. Which problem should he write down?

Question 3 of 3

Sam needs to find the sum of 345 + 200 and also the sum of 345 + 278. Which pair of strategies should Sam use to solve the two problems most efficiently?

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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.