Look at the 3s in the first problem. What is the value
of the red 3? What is the value of the blue 3?
Red = 300; blue = 30.
Look at the 2s in the second problem. What is the value of the red 2? What is the value of the blue 2?
Red = 20; blue = 2.
Find the sum of
The sum is 492; student strategies are based on place value, properties of operations, and/or the inverse relationship of addition and subtraction.
Did you need to make
any trades when you added? If so, what were they and why did you make them?
Yes; trade 10 ones for 1 ten; answers vary.
Find the difference of
363; student strategies are based on place value, properties of operations, and/or the inverse relationship of addition and subtraction.
Did you need to make any trades when you subtracted? If so, what trades did you make? Why did you make them?
Possible response: Yes, I traded 1 hundred for 10 tens because I couldn't take 6 tens away from 2 tens.
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