Decimal Operations: Add, Subtract, Multiply, Divide — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 8.4 ÷ 4 = 2.1
Divide 84 ÷ 4 = 21. The dividend has 1 decimal place, so the quotient is 2.1.
2. 0.72 ÷ 9 = 0.08
72 ÷ 9 = 8. 0.72 has 2 decimal places, so the quotient is 0.08.
3. 15.5 ÷ 5 = 3.1
155 ÷ 5 = 31. 15.5 has 1 decimal place, so the quotient is 3.1.
4. When dividing 6.3 ÷ 7, the quotient is 0.9.
63 ÷ 7 = 9. 6.3 has 1 decimal place, so the quotient is 0.9.
5. 24.48 ÷ 8 = 3.06
2448 ÷ 8 = 306. 24.48 has 2 decimal places, so the quotient is 3.06.
6. To divide 4.5 ÷ 0.5, multiply both by 10 to get 45 ÷ 5.
Multiplying both dividend and divisor by 10: 4.5 × 10 = 45 and 0.5 × 10 = 5. So 4.5 ÷ 0.5 = 45 ÷ 5 = 9.
7. 0.144 ÷ 12 = 0.012
144 ÷ 12 = 12. 0.144 has 3 decimal places, so the quotient is 0.012.
8. The quotient of 9.36 ÷ 4 is 2.34.
936 ÷ 4 = 234. 9.36 has 2 decimal places, so the quotient is 2.34.
9. If 3.6 ÷ 0.9 = 4, then 0.9 × 4 = 3.6.
Division and multiplication are inverse operations. If 3.6 ÷ 0.9 = 4, then 0.9 × 4 = 3.6.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
7.2 ÷ 8
→ 0.9
2.5
4.56 ÷ 6
→ 0.76
0.76
0.48 ÷ 4
→ 0.12
0.9
12.5 ÷ 5
→ 2.5
0.12
7.2÷8=0.9; 4.56÷6=0.76; 0.48÷4=0.12; 12.5÷5=2.5.