Decimal Operations: Add, Subtract, Multiply, Divide — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Maria buys 3 notebooks at $2.45 each and a pen for $1.80. Total cost?
A) $8.15
B) $9.15
C) $9.35
D) $8.55
3 × $2.45 = $7.35. Then $7.35 + $1.80 = $9.15.
2. A rope is 12.6 m long, cut into 4 equal pieces. How long is each piece?
A) 3.05 m
B) 3.15 m
C) 3.25 m
D) 3.50 m
12.6 ÷ 4 = 3.15 meters each.
3. Sam ran 2.75 km, 3.4 km, and 1.85 km on three days. Total distance?
A) 7.00 km
B) 7.50 km
C) 8.00 km
D) 8.10 km
2.75 + 3.4 + 1.85 = 2.75 + 3.40 + 1.85 = 8.00 km.
4. A box weighs 0.85 kg. How much do 20 boxes weigh?
A) 16.0 kg
B) 17.0 kg
C) 15.5 kg
D) 18.5 kg
0.85 × 20 = 17.0 kg.
Part B: Fill in the Blank
Write the correct answer on each line.
1. A book costs $14.95 and a bookmark costs $3.50. The total cost is $18.45.
14.95 + 3.50 = 18.45. Total cost: $18.45.
2. Emma has $20.00 and spends $4.75. Her change is $15.25.
20.00 − 4.75 = 15.25. Change: $15.25.
3. Six friends share a $47.10 bill equally. Each person pays $7.85.
47.10 ÷ 6 = 7.85. Each person pays $7.85.
4. A bag of flour weighs 2.25 kg. Three bags weigh 6.75 kg in total.
2.25 × 3 = 6.75 kg.
5. A car travels 156.8 km in 4 hours. Its average speed is 39.2 km/h.
156.8 ÷ 4 = 39.2 km/h.