# Determining Reasonable Answer Worksheet With Answer Key

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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.
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
no
4.
1) 10 × 501 = 5,010
2) 468 × 5 = 2,343
yes
5.
yes
6.
3) 2 × 204 = 408
4) 2 × 804 = 1,609
no
7.
5) 599 × 2 = 1,198
6) 190 × 10 = 1,900
no
8.
yes
7) 10 × 599 = 5,994
8) 980 × 2 = 1,961
9.
no
10.
9) 185 × 10 = 1,850
10) 445 × 10 = 4,456
no
11.
11) 2 × 614 = 1,229
12) 194 × 5 = 971
no
12.
no
13.
13) 980 × 10 = 9,801
14) 480 × 5 = 2,402
no
14.
15) 5 × 436 = 2,180
16) 468 × 2 = 936
yes
15.
yes
16.
17) 10 × 990 = 9,906
18) 661 × 5 = 3,309
no
17.
19) 482 × 2 = 964
20) 623 × 5 = 3,115
no
18.
yes
19.
yes
20.
1-10 95 90 85 80 75 70 65 60 55 50
2
Math
11-20 45 40 35 30 25 20 15 10 5
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