Math 7 Unit 3 Review Sections 3.3 to 3.6
Section 3.3
Adding and Subtraction Decimals
1. Estimate the sum or difference using front-end estimation.
A. 25.45 + 12.7
B. 8.7 − 2.65
C. 10.37 + 6.5
D. 4356
. − 5.3
B. 45.04 − 12.5
C. 12.09 + 27.4
D. 98.4 − 34.75
2. Add or subtract.
A. 35.2 + 6.93
3. John collected for the Lung Association. On Monday he collected $12.45. On Tuesday he collected
$10.38. On Wednesday he collected $18.56. On Thursday he collected $23.39. On Friday he
collected $45.88. On Saturday he collected $33.25. On Sunday he didn’t go collecting.
A. How much did John collect in total for the entire week?
B. How much more did John collect on Friday than he did on Saturday?
4. Mary boxes bananas at a local farm just outside her home town. Over a short period of time she
packaged boxes that weighed 25.2 kg, 24.8 kg, 26.1 kg, 23.9 kg and 27.2 kg.
A. Using front-end estimation, estimate the total mass of the 5 boxes of bananas.
B. Find the actual weight of the 5 boxes of bananas.
Section 3.4
Multiplying Decimals
1. Multiply.
A. 3.6 × 4.5
B. 21.7 × 0.39
2. Use a rectangle model to find each product.
A. 2.8 × 3.4
.
B. 0.7 × 13
3. Use front-end estimation to estimate the product.
A. 4.5 × 12.3
B. 9.3 × 4.6
4.. Use mental math strategies to find each product.
5.
A. 45.3 × 1000
B. 178.34 × 100
C. 0.8921 × 10
D. 67.23 × 10000
E. 34.25 × 0.01
F. 5.76 × 01
.
G. 89.25 × 0.001
H. 192.73 × 0.0001
Use front-end estimation to estimate the product.
Then use your calculator to get the actual answer.
A. 2.75 × 23.4
B. 15.75 × 4.68
C. 123.45 × 0.37
9. Find the cost of each product at the No-Frills.
3.4 kg of apples at $2.59/ kg
B. 2.75 kg of coffee at $5.99/kg
10. The fuel consumption of Ted’s hummer is 13.9 Km/L in the city and 16.7 Km/L on the highway.
A. If his gas tank holds 90 liters, how far could Ted travel in the city on a tank of gas?
B. How far could he travel on the highway on a tank of gas?
C. What assumptions did you make?
Section 3.5
Dividing Decimals
1. Use mental math to divide.
A. 67.3 ÷ 100
B. 0.782 ÷ 10
C. 0.045 ÷ 1000
D. 309512
. ÷ 10000
E. 23134
. ÷ 0.01
F. 0.035 ÷ 0.0001
G. 10.798 ÷ 01
.
H. 2.0083 ÷ 0.001
2. Divide, using long division, by changing the divisor to a whole number.
A. 35.4 ÷ 0.6
3.
Estimate each quotient.
Then find the actual quotient using your calculator.
A. 1196
. ÷ 2.3
4.
B. 174
. ÷ 0.3
B. 26.56 ÷ 3.2
Divide. Write each quotient to the nearest tenth by rounding.
A. 5.3 ÷ 2.1
B. 42.8 ÷ 123
.
5.
A case of 370 mL cans of Carnation milk cost $44.40 at Costco. If there are 24 cans in a case,
how much does each can cost?
6.
Jill works at McDonald’s part time. She works 24 hours per week and earns $270 before taxes
are taken out. How much does she get paid per hour?
7.
Mary rides her bike every day back and forth to school. In one school week she rode 13.5 km.
How far does she ride each day?
Section 3.6
Order of Operations with Decimals – BEDMAS
1. Evaluate.
. ) ÷ 0.9
(5.9 − 14
A. 3.2 − 0.5 × 5
B.
C. 13.7 + 5.2 × 4 − 9.75
.
D. 0.7 × 4.3 − 4.8 ÷ (5.3 + 2.7) + 132