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Estimates
Multiply multi-digit numbers
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Word Problems
100

Estimate the product. Explain if it is an overestimate or underestimate.

45 x 98

50 x 100 = 5,000

overestimate

100

Find the product.

11 x 103

11,000

100

Find the product. Check whether your answer is reasonable.

102 x 104

Estimate: 100 x 100 = 10,000

102 x 104 = 10,608

100

You estimate 27 x 103 using compatible numbers 25 and 100.  Is your answer an over estimate or underestimate?

underestimate

200

Estimate the product. Explain if it is an overestimate or underestimate.

21 x 404

20 x 400 = 8,000

underestimate

200

Find the product.

206 x 102

20,600

200

Find the product. Check whether your answer is reasonable.

185 x 123

Estimate: 200 x 100 = 20,000

185 x 123 = 22,755

200

A movie theater sells tickets for $9.  The theater sells 283 tickets.  How much money does the theater collect?

283 x $9 = $1,032

300

Estimate the product. Explain if it is an overestimate or underestimate.

7,346 x 2

7,000 x 2 = 14,000

underestimate

300

Find the product. Check whether your answer is reasonable.

72 x 13

Estimate: 70 x 15 = 1,000

72 x 13 = 936

300

Find the product. Check whether your answer is reasonable.

3,410 x 251

Estimate: 3,000 x 300 = 900,000

3,410 x 251 = 855,910

300

A ruby team sells tickets for $8. The team sells 129 tickets.  How much money does the rugby team collect?

129 x $8 = $1,032

400

Estimate the product. Explain if it is an overestimate or underestimate.

87,294 x 3

90,000 x 3 = 270,000

overestimate

400

Find the product. Check whether your answer is reasonable.

96 x 24

Estimate: 100 x 20 = 2,000

96 x 24 = 2,304

400

Find the product. Check whether your answer is reasonable.

1,564 x 389

Estimate: 1,500 x 400 = 600,000

1,564 x 389 = 608,396

400

Your friend needs a guitar for 10 months. He can rent a guitar for $22 each month plus a one-time fee of $50, or he can buy a guitar for $230.  Should ehe buy or rent a guitar?

Rent: 10 x $22 + $50 = $270

He should buy a guitar.

500

Estimate the product. Explain if it is an overestimate or underestimate.

246,973 x 5

200,000 x 5 = 1,000,000

underestimate

500

Find the product. Check whether your answer is reasonable.

2,079 x 82

Estimate: 2,000 x 80 = 160,000

2,079 x 82 = 170,478

500

Find the product. Check whether your answer is reasonable.

6,301 x 472

Estimate: 6,000 x 500 = 3,000,000

6,301 x 472 = 2,974,072


500

A school store sells 24 sweatshirts and 24 blankets.  Each sweatshirt costs $44. Each blanket costs $28.  How much more does the school earn from selling the sweatshirts than from selling the blankets?

Sweatshirts: 24 x $44 = $1,056

Blankets: 24 x $28 = $672

$1,056 - $672 =$384