Look at problem A. How many hundreds, tens, and ones are shown?
3 hundreds, 5 tens, and 3 ones.
What is the sum in problem B? How do you know?
99; Possible response: 4 tens plus 5 tens is 9 tens, and 3 ones plus 6 ones is 9 ones. So, the answer is 9 tens and 9 ones, or 99.
What is the difference in problem C? How do you know?
45; answers may include thinking of a related addition problem, subtracting by place value and regrouping, and so forth.
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