Adding
24 + 13
37
46 − 12
34
15
True or False? 34 + 18 = 52.
True
36+27
63
52 − 28
24
14 − 6
8
A student solves 42 − 17 = 35. What did the student do wrong? What is the correct answer?
The student did not regroup correctly. The correct answer is 25.
48 + 35
83
71 − 36
35
9 + 6
15
Does 56 + 27 require regrouping? Explain why.
Yes. 6 + 7 = 13 ones, so trade 10 ones for 1 ten.
167 + 25
192
153 − 27
126
8 + ___ = 14
6
There are 63 books on a shelf. Students check out 28 books. How many books are left?
35 books
278 + 146
424
402 − 168
234
6 + 7 + 4
17
A student solves 38 + 25 = 513. Explain the mistake and find the correct answer.
The student did not regroup the 13 ones. Trade 10 ones for 1 ten. The correct answer is 63.