Rounding and Multiplying 2 and 3 digit by 1 digit

What is the product of 500 x 4?

• 200

• 2,000

• 504

• 900

Answer explanation

The basic fact is 5 x 4 = 20. There are two more 0s in the problem, so there will be a total of three 0s in the product. One from the basic fact and one two from the factors in the problem.

Tags

CCSS.4.NBT.B.5

What is the product of 300 x 60?

• 24,000

• 2,400

• 18,000

• 1,800

Answer explanation

Basic fact is 3 x 6 = 18.

There are three 0s in the problem, so you need to add three 0s to the product.

Tags

CCSS.5.NBT.B.5

700 x 800

(Don't forget your comma!)

(a)  

Answer explanation

The basic fact 7 x 8 = 56. There are four 0s in the problem.

Tags

CCSS.5.NBT.B.5

35 x 9 is about?

• 270

• 315

• 300

• 360

Answer explanation

Round 35 to 40. 40 x 9 = 360

Tags

CCSS.4.NBT.B.5

27 x 7 is about?

• 210

• 2,100

• 140

• 189

Answer explanation

27 rounds to 30. 30 x 7 = 210

8 x 512 is about?

• 400

• 480

• 4,800

• 4,000

Answer explanation

512 rounds to 500. 8 x 5 is 40, then add the other two 0s.

Tags

CCSS.4.NBT.B.5

The four local post offices are doing a food drive. If each post office has a goal of collecting 600 cans, how many cans should they collect?

• 1,800

• 180

• 2,400

• 24,000

Answer explanation

4 x 600 = 2,400

4 x 6 = 24 and there are two 0s.

Tags

CCSS.5.NBT.B.5

What is the product of 73 x 8?

• 81

• 584

• 94

• 234

Tags

CCSS.4.NBT.B.5

What is the product of 912 x 9

• 8,208

• 8,108

• 8,198

• 1,898

Tags

CCSS.4.NBT.B.5

854 X 6

(Don't forget your comma!)

(a)  

Tags

CCSS.4.NBT.B.5