1. Why do we break numbers into tens and ones? Choose a two-digit number and explain how partitioning it helps you understand how big it is. 2. What does the position of a digit tell us about its ...

Join Mrs. Markavich for a missing addend word problem with Professor Barble! Next look out for two of favorite Math Might friends D.C. and Value Pak as they help use learn to add two-digit number in ...

19 is only 1 away from 20, so you prefer to start by multiplying 20 times 5, which equals 100. Then we need to take away a squadron of 5, because there are actually only 19 squadrons, not 20. 100 take ...

Numbers can be shown in many ways, not just as written digits. Explore how to represent numbers using materials such as base-10 blocks, find their position on a number line and locate them on a number ...