Estimating Products and Quotients Mastery

Why is it important to be exact in certain calculations, like building a house?

• To save time

• To ensure safety and stability

• To use more materials

• To make it look good

What are compatible numbers?

• Numbers that can be easily added

• Numbers that are always even

• Numbers that are close to each other

• Numbers that can be easily multiplied or divided mentally

Which of the following pairs are compatible numbers for estimating 4.9 × 6.3?

• 4 and 5

• 5 and 6

• 6 and 7

• 7 and 8

If you have to estimate 7.4 × 10.9, which pair of numbers would be a good choice?

• 7 and 10

• 7 and 11

• 6 and 10

• 8 and 11

For estimating 12.9 × 14.7, which of the following pairs would be a reasonable choice?

• 10 and 15

• 13 and 15

• 12 and 14

• 11 and 13

When estimating quotients, why is it important to choose numbers that do not result in remainders?

• To use fewer numbers

• To ensure the estimation is accurate

• To avoid confusion

• To make the calculation faster

Which pair of numbers would be a good choice for estimating 7.2 ÷ 3.4?

• 8 and 4

• 6 and 3

• 5 and 2

• 7 and 3

For estimating 31.7 ÷ 4.9, which pair of numbers would be a reasonable choice?

• 31 and 5

• 32 and 4

• 30 and 4

• 30 and 5

Which pair of numbers would be a good choice for estimating 52.9 ÷ 8.2?

• 56 and 8

• 54 and 8

• 50 and 8

• 52 and 8

What is the estimated product of 7.8 × 4.9 using compatible numbers?

• 35

• 40

• 45

• 50