Unit 6: Multiply Decimals

Which of these are equivalent to 6.8 × 10³? Choose all that apply.

• 6.8 × 10 × 3

• 6.8 × 10 × 10 × 10

• 680

• 6,800

Knowing that 8.4 × 10² = 840, what is 8.4 × 10⁴?

• 840

• 8,400

• 84,000

• 840,000

A company sells trail mix for $3.65 per pound. About how much would it cost to buy a bag of trail mix weighing 5 pounds? It would cost about _____ to buy a bag of trail mix weighing 5 pounds.

According to her step-counter, Juanita walked 1.6 × 10⁴ steps yesterday. How many steps did Juanita walk yesterday?

• 16 steps

• 160 steps

• 1,600 steps

• 16,000 steps

Which sum is equivalent to 4.8 × 0.7?

• 280 + 56

• 28 + 5.6

• 2.8 + 5.6

• 2.8 + 0.56

Which equation is represented by the decimal grid?

• 0.07 × 0.04 = 0.28

• 7 × 0.4 = 2.8

• 0.7 × 0.4 = 2.8

• 0.7 × 0.4 = 0.28

A sandwich shop uses 0.14 pound of tomato on each sandwich. How much tomato will the shop need to make 6 sandwiches? Use the decimal grid to help you solve.

Keith knows that 6.3 × 47 = 296.1. Use place-value patterns to decide whether each equation is True or False.​ Select the cells that correctly represent true mathematical statements.

• True

• 63 x 47 = 29,610

• False

• 6.3 x 4.7 = 29.61

• Trie

• 63 x 0.47 = 296.1

• False

• 63 x 4.7 = 296.1

Zara knows that 23 × 0.86 = 19.78. What is 2.3 × 8.6?

• 1.978

• 19.78

• 197.8

• 1,978

A rectangular card measures 6.2 inches long by 4.8 inches wide. Which is the best estimate for the area of the card?

• about 11 square inches

• about 20 square inches

• about 30 square inches

• about 50 square inches