Estimating Products

Round 354 to the
nearest hundred

Fill in the Blanks

Round 354 to the nearest hundred

Fill in the Blanks

Round 2,956 to the nearest thousand

Fill in the Blanks

Round 442 to the nearest hundred

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Round 849 to the nearest hundred

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Round 8,499 to the nearest thousand

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Round 44 to the nearest ten

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Round 94 to the nearest ten

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Round 7,412 to the nearest thousand

Multiple Choice

What does it mean to estimate?

• To make an educated guess

• To give an exact answer

We can use estimating to solve 3 x 165. If I round to the nearest hundred, this will be easier to solve!

Step 1: Round the
bigger number to the nearest hundred.

3 x 165

3 x 200

3 x 165

Step 2:

Think: 3 x 200

1.

Figure out your basic
fact: 3 x 2 = 6

2.

Count the number of zeros in your bigger number -- 200 has 2 zeros!

3.

Add that to your answer

4.

SO…. 3 x 200 = 600

Step 1: Round the
bigger number to the nearest ten.

4 x 86

4 x 90

4 x 86

Step 2:

Think: 4 x 90

1.

Figure out your basic
fact: 4 x 9 = 36

2.

Count the number of zeros in your bigger number -- 90 has 1 zero!

3.

Add that to your answer

4.

SO…. 4 x 90 = 360

Step 1: Round the
bigger number to the nearest thousand.

4 x 2,621

4 x 3,000

4 x 2,621

Step 2:

Think: 4 x 3,000

1.

Figure out your basic
fact: 4 x 3 = 12

2.

Count the number of
zeros in your bigger
number -- 3,000 has 3 zeros!

3.

Add that to your answer

4.

SO... 4 x 3,000 = 12,000

​YOUR TURN!!

Use estimating to find

6 x 316

Fill in the Blanks

Round 316 to the nearest hundred.

Fill in the Blanks

Now, solve:

6 x 300

Use estimating to find

5 x 29

Fill in the Blanks

Round 29 to the nearest ten.

Fill in the Blanks

Now, solve:

5 x 30

Use estimating to find

5 x 2,213

Fill in the Blanks

Round 2,213 to the nearest thousand.

Fill in the Blanks

Now, solve:

5 x 2,000

Use estimating to find

6 x 4,113

Fill in the Blanks

Round 4,113 to the nearest thousand.

Fill in the Blanks

Now, solve:

6 x 4,000

Use estimating to find

7 x 473

Fill in the Blanks

Round 473 to the nearest hundred.

Fill in the Blanks

Now, solve:

7 x 500