I'll solve each multiplication problem step by step, then verify the answers are reasonable.
Problem a: 2.7 × 2
- 2.7 × 2 = 5.4
- Check: 2.7 is close to 3, and 3 × 2 = 6, so 5.4 is reasonable ✓
Problem b: 5.4 × 3
- 5.4 × 3 = 16.2
- Check: 5.4 is close to 5, and 5 × 3 = 15, so 16.2 is reasonable ✓
Problem c: 0.8 × 3
- 0.8 × 3 = 2.4
- Check: 0.8 is close to 1, and 1 × 3 = 3, so 2.4 is reasonable ✓
Problem d: 23.4 × 4
- 23.4 × 4 = 93.6
- Check: 23.4 is close to 23, and 23 × 4 = 92, so 93.6 is reasonable ✓
Problem e: 14.6 × 5
- 14.6 × 5 = 73.0
- Check: 14.6 is close to 15, and 15 × 5 = 75, so 73 is reasonable ✓
Problem f: 20.3 × 6
- 20.3 × 6 = 121.8
- Check: 20.3 is close to 20, and 20 × 6 = 120, so 121.8 is reasonable ✓
Problem g: 3.24 × 3
- 3.24 × 3 = 9.72
- Check: 3.24 is close to 3, and 3 × 3 = 9, so 9.72 is reasonable ✓
Problem h: 4.78 × 2
- 4.78 × 2 = 9.56
- Check: 4.78 is close to 5, and 5 × 2 = 10, so 9.56 is reasonable ✓
Problem i: 2.07 × 3
- 2.07 × 3 = 6.21
- Check: 2.07 is close to 2, and 2 × 3 = 6, so 6.21 is reasonable ✓
Problem j: 16.35 × 3
- 16.35 × 3 = 49.05
- Check: 16.35 is close to 16, and 16 × 3 = 48, so 49.05 is reasonable ✓
Problem k: 10.83 × 6
- 10.83 × 6 = 64.98
- Check: 10.83 is close to 11, and 11 × 6 = 66, so 64.98 is reasonable ✓
Problem l: 34.98 × 3
- 34.98 × 3 = 104.94
- Check: 34.98 is close to 35, and 35 × 3 = 105, so 104.94 is reasonable ✓
Final Answer:
a) 5.4
b) 16.2
c) 2.4
d) 93.6
e) 73.0
f) 121.8
g) 9.72
h) 9.56
i) 6.21
j) 49.05
k) 64.98
l) 104.94
Parent Tip: Review the logic above to help your child master the concept of 3 by 1 decimal multiplication worksheet.
