Solve addition and subtraction problems including missing-number problems, using number facts, place value, and more complex methods
A first look
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Question 1 of 3
What number should replace the question mark? 245 + ? = 380
Question 2 of 3
What number should replace the question mark in the equation 245 + ? = 380?
Question 3 of 3
Liam had 642 marbles. He gave 185 marbles to a friend. Afterwards he wants to have exactly 800 marbles, so he buys more marbles. How many marbles must he buy?
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