3.7 Multiply Decimals

Arnold is solving this multiplication problem: 8.12 × 4.7. Which of these estimates can Arnold use to help him determine where the decimal point belongs in the product?

• 80 × 40 = 3,200

• 8 × 5 = 40

• 800 × 4 = 3,200

• 800 × 5 = 4,000

Tags

CCSS.5.NBT.B.7

Multi-Step

Gina bought 2.5 pounds of peaches that cost $1.38 per pound at the grocery store. Amy went to the local farmer’s market and purchased 3.5 pounds of peaches at $0.98 per pound. Who spent more money, and how much more?

• Gina, $0.20

• Gina, $0.02

• Amy, $0.20

• Amy, $0.02

Tags

CCSS.7.EE.B.3

A vine in Mr. Jackson’s garden was 3.6 feet long. When it is measured again, it is 2.1 times as long. How long is the vine?

• 7.5 feet

• 5.7 feet

• 6.6 feet

• 7.56 feet

Tags

CCSS.7.EE.B.3

The width of Mr. Simm’s driveway is 9.2 meters. The length is 3.4 times the width. What is the length of the driveway?

Tags

CCSS.7.EE.B.3

A female orangutan at the zoo weighs 79.3 pounds. A male orangutan weighs 2.3 times as much as the female orangutan. How much does the male orangutan weigh?

Tags

CCSS.7.EE.B.3

Javier uses estimation to check the product for 7.24 × 3.9. Which of the following is a reasonable estimate for the product?

• 700 × 40 = 28,00

• 700 × 3 = 2,100

• 7 × 4 = 28

• 70 × 40 = 2,800

Tags

CCSS.5.NBT.B.7

Which multiplication problem will give the same product as 4.6 × 5.2?

• 0.46 × 52

• 4.6 × 0.52

• 46 × 5.2

• 0.46 × 5.2

Tags

CCSS.5.NBT.B.7

Mrs. Jones plants two evergreen trees in her yard. The first tree is 6.25 feet tall. The second tree is 0.5 times as tall. How tall is the second tree?

• 3.255 feet

• 6.125 feet

• 3.125 feet

• 6.750 feet

Tags

CCSS.6.NS.B.3

Mr. Endo buys 13.6 gallons of gasoline. He pays $3.95 per gallon. How much does Mr. Endo spend on gasoline?

• $53.72

• $17.55

• $9.65

• $39.00

Tags

CCSS.6.NS.B.3

Multi-Step

Maria makes a quilt with a width of 2.7 meters. The length is 3.2 times the width. The area of a rectangle is the length times the width of the rectangle. What is the area of Maria’s quilt?

• 8.64 square meters

• 23.328 square meters

• 5.90 square meters

• 27.648 square meters

Tags

CCSS.7.EE.B.3