Math Lesson 7
Factoring (Grade 6)
Name:__________________
www.etap.org
Instruction 7-1
Estimate, Round off, and Manipulate
Very Small and Very Large Numbers
Worksheet 8
Date:__________________
Use front-end estimation and then solve the problem.
1. Example 49 x 75
Step 1
Round off 49: → 50
Step 2
Round off 75: → 80
Step 3
Multiply 50 x 80 = 4,000 Answer: 4,000
Answer
2.
63 x 95
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3.
405 x 32
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4.
325 x 752
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5.
25 x 63
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6.
329 x 74
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7.
258 x 65
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8.
123 x 25
____________________
9.
457 x 658
____________________
10.
657 x 69
____________________
1 of 2
© B. J. Subbiondo 2003
Math Lesson 7
Factoring (Grade 6)
Name:__________________
Instruction 7-1
Estimate, Round off, and Manipulate
Very Small and Very Large Numbers
Worksheet 8
www.etap.org
Date:__________________
Answer Key
Use front-end estimation and then solve the problem.
Answer
2 of 2
1.
49 x 75
4,000
2.
63 x 9
6,000
3.
405 x 32
12,000
4.
325 x 752
240,000
5.
25 x 63
1,800
6.
329 x 74
21,000
7.
258 x 65
21,000
8.
123 x 25
3,000
9.
457 x 658
350,000
10.
657 x 69
49,000
© B. J. Subbiondo 2003