Let’s solve each problem step by step.
First, the multiplication problems:
1. 21 × 5
Think: 20 × 5 = 100, and 1 × 5 = 5 → 100 + 5 =
105
2. 34 × 2
Think: 30 × 2 = 60, and 4 × 2 = 8 → 60 + 8 =
68
3. 30 × 3
Think: 3 × 3 = 9, then add a zero →
90
4. 42 × 4
Think: 40 × 4 = 160, and 2 × 4 = 8 → 160 + 8 =
168
5. 51 × 2
Think: 50 × 2 = 100, and 1 × 2 = 2 → 100 + 2 =
102
6. 73 × 3
Think: 70 × 3 = 210, and 3 × 3 = 9 → 210 + 9 =
219
7. 12 × 4
Think: 10 × 4 = 40, and 2 × 4 = 8 → 40 + 8 =
48
8. 61 × 6
Think: 60 × 6 = 360, and 1 × 6 = 6 → 360 + 6 =
366
Now, the division problems:
1. 20 ÷ 2
Think: How many 2s in 20? 2 × 10 = 20 →
10
2. 15 ÷ 5
Think: 5 × 3 = 15 →
3
3. 32 ÷ 4
Think: 4 × 8 = 32 →
8
4. 16 ÷ 2
Think: 2 × 8 = 16 →
8
5. 45 ÷ 5
Think: 5 × 9 = 45 →
9
6. 27 ÷ 3
Think: 3 × 9 = 27 →
9
7. 12 ÷ 3
Think: 3 × 4 = 12 →
4
8. 16 ÷ 4
Think: 4 × 4 = 16 →
4
All answers checked carefully.
Final Answer:
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
Parent Tip: Review the logic above to help your child master the concept of worksheet on division grade.
