Determining Reasonable Answer Worksheet With Answer Key Page 19

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Determining Reasonable Answer
Determine if the answer shown is reasonable (yes) or not (no).
A n s w e r s
yes
Anything times 2 HAS to end in an even number (2,4,6,8,0).
Ex. 2 × 6 = 12
2 × 13 = 26
1.
yes
Anything times 5 HAS to end in an either a 5 or a 0.
Ex. 5 × 4 = 20
5 × 15 = 75
2.
yes
3.
Anything times 10 HAS to end in a 0.
Ex. 10 × 7 = 70
10 × 16 = 160
no
4.
1) 478 × 10 = 4,780
2) 897 × 5 = 4,485
yes
5.
no
6.
3) 5 × 853 = 4,265
4) 5 × 410 = 2,052
no
7.
5) 700 × 10 = 7,000
6) 153 × 10 = 1,533
yes
8.
yes
7) 2 × 415 = 831
8) 252 × 2 = 504
9.
no
10.
9) 401 × 2 = 802
10) 5 × 733 = 3,666
no
11.
11) 2 × 722 = 1,445
12) 581 × 5 = 2,905
yes
12.
yes
13.
13) 115 × 5 = 575
14) 2 × 333 = 667
no
14.
15) 977 × 10 = 9,770
16) 2 × 301 = 602
yes
15.
yes
16.
17) 241 × 10 = 2,418
18) 838 × 10 = 8,386
no
17.
19) 2 × 773 = 1,546
20) 5 × 163 = 819
no
18.
yes
19.
no
20.
1-10 95 90 85 80 75 70 65 60 55 50
10
Math
11-20 45 40 35 30 25 20 15 10 5
0

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