Let’s solve each problem one by one. We’ll do multiplication first, then division.
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Multiplication Problems:
① 15 × 7
Think: 10×7 = 70, and 5×7 = 35 → 70 + 35 =
105
② 60 × 3
6×3 = 18, so 60×3 =
180
③ 28 × 5
20×5 = 100, 8×5 = 40 → 100 + 40 =
140
④ 32 × 4
30×4 = 120, 2×4 = 8 → 120 + 8 =
128
⑤ 18 × 6
10×6 = 60, 8×6 = 48 → 60 + 48 =
108
⑥ 17 × 7
10×7 = 70, 7×7 = 49 → 70 + 49 =
119
⑦ 19 × 9
20×9 = 180, minus 1×9 = 9 → 180 - 9 =
171
⑧ 27 × 8
20×8 = 160, 7×8 = 56 → 160 + 56 =
216
⑨ 64 × 2
60×2 = 120, 4×2 = 8 → 120 + 8 =
128
⑩ 16 × 9
10×9 = 90, 6×9 = 54 → 90 + 54 =
144
⑪ 14 × 6
10×6 = 60, 4×6 = 24 → 60 + 24 =
84
⑫ 22 × 4
20×4 = 80, 2×4 = 8 → 80 + 8 =
88
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Division Problems (use long division or think “how many times does the divisor fit into the dividend?”):
⑬ 72 ÷ 8
8 × 9 = 72 →
9
⑭ 56 ÷ 7
7 × 8 = 56 →
8
⑮ 54 ÷ 6
6 × 9 = 54 →
9
⑯ 84 ÷ 3
3 × 28 = 84 →
28
(Or: 3×20=60, 84-60=24, 3×8=24 → 20+8=28)
⑰ 81 ÷ 9
9 × 9 = 81 →
9
⑱ 64 ÷ 4
4 × 16 = 64 →
16
(Or: 4×10=40, 64-40=24, 4×6=24 → 10+6=16)
⑲ 183 ÷ 3
3 × 60 = 180, 183 - 180 = 3, 3÷3=1 → 60+1 =
61
⑳ 42 ÷ 6
6 × 7 = 42 →
7
㉑ 96 ÷ 8
8 × 12 = 96 →
12
㉒ 91 ÷ 7
7 × 13 = 91 →
13
㉓ 45 ÷ 5
5 × 9 = 45 →
9
㉔ 49 ÷ 7
7 × 7 = 49 →
7
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Final Answer:
① 105
② 180
③ 140
④ 128
⑤ 108
⑥ 119
⑦ 171
⑧ 216
⑨ 128
⑩ 144
⑪ 84
⑫ 88
⑬ 9
⑭ 8
⑮ 9
⑯ 28
⑰ 9
⑱ 16
⑲ 61
⑳ 7
㉑ 12
㉒ 13
㉓ 9
㉔ 7
Parent Tip: Review the logic above to help your child master the concept of division and multiplication worksheet for 4th grade.
