Look at the first equation in Part 1. How can you use place value to find the missing sum? What is it?
Break up the numbers by place value:
How can you rearrange the addends to make the second equation simpler? What is the missing sum?
Rearrange and group 37 and 13 to make a ten; the sum is 64.
How can you group the addends to make the third equation simpler? What is the missing sum?
Group 24 and 16 to make a ten; the sum is 58.
How can you use opposite operations to find the missing number in the fourth equation? What is the missing number?
Subtract:
How can you use opposite operations to find the missing number in the fifth equation? What is the missing number?
Add:
Look at the length model
in Part 2. What fraction of the whole rectangle does each equal part represent?
Each part is
Now look at the number line. What fraction does each equal part represent?
Each part represents
How many of these equal parts are in the length from zero to the red point?
4 equal parts.
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