Multiplication Estimation

Front

What is multiplication estimation?

Back

Multiplication estimation is a method used to find an approximate product of two numbers by rounding them to easier numbers before multiplying.

Tags

CCSS.4.NBT.B.5

Front

How do you estimate the product of 56 x 76?

Back

Round 56 to 60 and 76 to 80. Then multiply: 60 x 80 = 4800.

Tags

CCSS.4.NBT.B.5

Front

What is the estimated product of 36 x 69?

Back

Round 36 to 40 and 69 to 70. Then multiply: 40 x 70 = 2800.

Tags

CCSS.4.NBT.B.5

Front

If Cindy earns $27 a week, how much does she earn in a year?

Back

Estimate by rounding $27 to $30. Then multiply: $30 x 52 weeks = $1560, which is close to $1500.

Front

How do you estimate the number of ants Isabelle has in 6 ant farms with 89 ants each?

Back

Round 89 to 90. Then multiply: 6 x 90 = 540.

Tags

CCSS.4.NBT.B.5

Front

What is the best estimate for 49 x 27?

Back

Round 49 to 50 and 27 to 30. Then multiply: 50 x 30 = 1500.

Tags

CCSS.4.NBT.B.5

Front

Why is estimation useful in multiplication?

Back

Estimation helps to quickly find an approximate answer without needing exact calculations, making it easier to check if a detailed calculation is reasonable.

Front

What is rounding in the context of estimation?

Back

Rounding is the process of adjusting a number to the nearest value that is easier to work with, often a multiple of 10, 100, etc.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

What is the estimated product of 25 x 48?

Back

Round 25 to 30 and 48 to 50. Then multiply: 30 x 50 = 1500.

Tags

CCSS.4.NBT.B.5

Front

How can you check if your estimation is reasonable?

Back

Compare your estimated product to the actual product to see if it is in the same range.

Tags

CCSS.4.NBT.B.5