Determining Reasonable Answer Worksheet With Answer Key Page 2

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Answer Key
Name:
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.
no
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
yes
4.
1) 507 × 2 = 1,014
2) 5 × 664 = 3,324
yes
5.
yes
6.
3) 2 × 579 = 1,158
4) 160 × 5 = 800
yes
7.
5) 10 × 904 = 9,040
6) 10 × 263 = 2,630
no
8.
yes
7) 2 × 609 = 1,218
8) 10 × 912 = 9,129
9.
no
10.
9) 5 × 774 = 3,870
10) 10 × 718 = 7,182
yes
11.
11) 588 × 5 = 2,940
12) 668 × 10 = 6,680
yes
12.
no
13.
13) 2 × 459 = 919
14) 2 × 309 = 619
no
14.
15) 10 × 764 = 7,643
16) 519 × 5 = 2,595
no
15.
yes
16.
17) 10 × 685 = 6,850
18) 834 × 10 = 8,343
yes
17.
19) 2 × 404 = 808
20) 5 × 402 = 2,013
no
18.
yes
19.
no
20.
1-10 95 90 85 80 75 70 65 60 55 50
5
Math
11-20 45 40 35 30 25 20 15 10 5
0

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