Let's solve the multiplication and division problems step by step.
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Multiplication Problems:
1.
21 × 5
$ 20 × 5 = 100 $, $ 1 × 5 = 5 $ → $ 100 + 5 = 105 $
✔ 105
2.
34 × 2
$ 30 × 2 = 60 $, $ 4 × 2 = 8 $ → $ 60 + 8 = 68 $
✔ 68
3.
30 × 3
$ 3 × 3 = 9 $, add a zero → $ 90 $
✔ 90
4.
42 × 4
$ 40 × 4 = 160 $, $ 2 × 4 = 8 $ → $ 160 + 8 = 168 $
✔ 168
5.
51 × 2
$ 50 × 2 = 100 $, $ 1 × 2 = 2 $ → $ 100 + 2 = 102 $
✔ 102
6.
73 × 3
$ 70 × 3 = 210 $, $ 3 × 3 = 9 $ → $ 210 + 9 = 219 $
✔ 219
7.
12 × 4
$ 10 × 4 = 40 $, $ 2 × 4 = 8 $ → $ 40 + 8 = 48 $
✔ 48
8.
61 × 6
$ 60 × 6 = 360 $, $ 1 × 6 = 6 $ → $ 360 + 6 = 366 $
✔ 366
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Division Problems:
1.
20 ÷ 2 = ?
$ 2 ÷ 2 = 1 $, so $ 20 ÷ 2 = 10 $
✔ 10
2.
15 ÷ 5 = ?
$ 5 × 3 = 15 $ → $ 15 ÷ 5 = 3 $
✔ 3
3.
32 ÷ 4 = ?
$ 4 × 8 = 32 $ → $ 32 ÷ 4 = 8 $
✔ 8
4.
16 ÷ 2 = ?
$ 2 × 8 = 16 $ → $ 16 ÷ 2 = 8 $
✔ 8
5.
45 ÷ 5 = ?
$ 5 × 9 = 45 $ → $ 45 ÷ 5 = 9 $
✔ 9
6.
27 ÷ 3 = ?
$ 3 × 9 = 27 $ → $ 27 ÷ 3 = 9 $
✔ 9
7.
12 ÷ 3 = ?
$ 3 × 4 = 12 $ → $ 12 ÷ 3 = 4 $
✔ 4
8.
16 ÷ 4 = ?
$ 4 × 4 = 16 $ → $ 16 ÷ 4 = 4 $
✔ 4
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✔ Final Answers:
####
Multiplication:
- 21 × 5 =
105
- 34 × 2 =
68
- 30 × 3 =
90
- 42 × 4 =
168
- 51 × 2 =
102
- 73 × 3 =
219
- 12 × 4 =
48
- 61 × 6 =
366
####
Division:
- 20 ÷ 2 =
10
- 15 ÷ 5 =
3
- 32 ÷ 4 =
8
- 16 ÷ 2 =
8
- 45 ÷ 5 =
9
- 27 ÷ 3 =
9
- 12 ÷ 3 =
4
- 16 ÷ 4 =
4
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Parent Tip: Review the logic above to help your child master the concept of 3rd grade math worksheet division.