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Estimation
Front-End Estimation
Factors
Multiples
Division/Multiplication
100

Pg. 66 # 10

87. Estimated value is 80

100

Pg. 66 #6

127, Front-end estimated value is 120
100

Pg. 67 #32

Factors of 16 are 1, 2, 4, 8, and 16.

100

Pg. 67 #37

5, 10, 15, 20 , 25, 30, 35, 40

100

Pg. 67 #16

126, estimated answer 120

200

Pg. 67 # 17

924. Estimated answer is 800

200

Pg. 66 #9

524, Front-end estimated value is 500

200

Pg. 66 #33

Factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36

200

Pg. 67 #36

4, 8, 12, 16, 20, 24, 28, 32

200

Pg. 67 #18

31, Estimated answer 30

300
Pg. 67 #26

42, Estimated Answer is 40

300

Pg. 66 #12

1,240, Front-end estimated value is 1,200

300

Pg. 67 #34

Common factors of 16 and 36 are 1, 2, and 4
300

Pg. 68 #44

She should buy the microwave and the coffee machine

300

Pg. 67 #19

14, Estimated answer 14

400

Pg. 67 #29

32. Estimated answer is about 33

400

Pg. 66 #13

272, Front-end estimated value is 300

400

Pg. 68 #39

LCM is 20

400

Pg. 68 #43

21 cars

400

Pg. 67 #26

42, Estimated answer 40

500

Pg. 68 #42

Estimated answer is 600

500

Pg. 66 #15

3,569, Front-end estimated value is 4,000

500

Pg. 68 #40

Prime Numbers are 23, 37, 79

Composite Numbers are 9, 32, 1,851

500

Pg. 68 #38

20, 40, 60

500

Pg. 67 #31

19, Estimated answer 20