Question 1

25 x 93

Accepted Answer

2,325

Answer

300

Answer

19,065

Answer

18,525

Question 2

94 x 36

Accepted Answer

3,384

Answer

684

Answer

846

Answer

8,136

Question 3

3,632 x 8

Accepted Answer

29,056

Answer

24,056

Answer

4,846

Answer

44,846

Question 4

2,531 x 4

Accepted Answer

10,124

Answer

6,974

Answer

9,224

Answer

8,024

Question 5

Look at Poster #1. Why is there a zero in the ones place?

Accepted Answer

The zero is in the ones place because we are now multiplying by a multiple of ten.

Answer

The zero in the ones place represents that we are on the second row of products.

Answer

The zero in the ones place is there because Ms. Wagner taught us to put one there.

Answer

The zero in the ones place is there because everything in the tens ends in a zero.

Question 6

Look at Poster #2 (45 x 17).  Determine  and explain the computational error.

Accepted Answer

The student forgot to put a zero in the ones place to represent multiplying by a multiple of ten.

Answer

The student did not make an error. The answer is correct.

Answer

The student did not multiplying the tens times the tens. The answer should be 40 x 10 = 400. The second row should be 450.

Answer

The student did not regroup when multiplying 7 x 5. They should regroup the 3 tens to the tens place.

Question 7

Look at Poster #3 (36 x 25).  Determine and explain the computational error.

Accepted Answer

The student did not include all parts of multiplication. They are missing 5 x 30 and 30 x 20.

Answer

The student did not regroup when multiplying 6 x 5. They should carry the 30 to the tens.

Answer

The student did not include a zero in the ones place to represent multiplying by a multiple  of 10.

Answer

The student did not make an error. The answer is correct.

Question 8

Estimate the answer. 48 x 92

Accepted Answer

4,500

Answer

3,600

Answer

5,000

Answer

450

Question 9

Estimate the answer.   24 x 31

Accepted Answer

600

Answer

900

Answer

6000

Answer

1,200

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