Multiplication w/ estimation

• 1,000

• 10,000

• 100

• 1,100

Answer explanation

To find the product of 10 and 100, multiply the two numbers: 10 × 100 = 1,000. Therefore, the correct answer is 1,000.

Tags

CCSS.5.NBT.A.2

• 240

• 300

• 280

• 250

Answer explanation

To estimate 47 rounded to the nearest ten is 50, and 6 rounded to the nearest ten is 10. Thus, 50 x 10 = 500. However, for the product of 47 x 6, rounding 47 to 50 gives a closer estimate of 250.

Tags

CCSS.4.NBT.B.5

• 30

• 25

• 20

• 40

Answer explanation

30 is a compatible number for estimating 29 x 4 because it is close to 29 and simplifies the multiplication to 30 x 4, which is easier to calculate (120). The other options are either too low or too high for accurate estimation.

Tags

CCSS.4.NBT.B.5

• Overestimate

• Underestimate

Answer explanation

Rounding 52 down to 50 decreases the value, leading to a product of 50 x 9 = 450. The actual product of 52 x 9 = 468 is greater, making the estimate an underestimate.

Tags

CCSS.4.NBT.B.5

• 10,000

• 100,000

• 1,000,000

• 100

Answer explanation

To find the product of 100 and 1,000, multiply the two numbers: 100 × 1,000 = 100,000. Therefore, the correct answer is 100,000.

Tags

CCSS.5.NBT.A.2

• 480

• 500

• 560

• 600

Answer explanation

To estimate 63, round to 60. For 8, round to 10. The product is 60 x 10 = 600. However, using 60 x 9 (since 8 is closer to 9) gives 540, and 63 x 8 is closer to 560. Thus, the best estimate is 560.

Tags

CCSS.4.NBT.B.5

• 70

• 75

• 80

• 60

Answer explanation

To estimate the product of 76 and 5, we look for a number close to 76 that is easy to multiply by 5. 75 is a compatible number because it is close to 76 and simplifies the calculation (75 x 5 = 375).

Tags

CCSS.4.NBT.B.5

• Overestimate

• Underestimate

Answer explanation

Rounding 89 up to 90 increases the value, leading to an estimate of 90 x 3 = 270. The actual calculation of 89 x 3 = 267 shows that the estimate is higher than the true value, making it an overestimate.

Tags

CCSS.4.NBT.B.5

• 10,000

• 1,000

• 100

• 100,000

Answer explanation

To find the product of 1,000 and 10, multiply the two numbers: 1,000 × 10 = 10,000. Therefore, the correct answer is 10,000.

Tags

CCSS.5.NBT.A.2

• 210

• 240

• 280

• 300

Answer explanation

To estimate 34 and 7, round 34 to 30 and 7 to 10. Then, calculate 30 × 10 = 300. However, rounding 34 to 30 is more accurate for this product, leading to 240 as the closest estimate. Thus, the correct answer is 240.

Tags

CCSS.4.NBT.B.5