# 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
no
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
yes
4.
1) 424 × 10 = 4,244
2) 118 × 10 = 1,180
no
5.
yes
6.
3) 2 × 503 = 1,006
4) 2 × 367 = 734
no
7.
5) 227 × 2 = 455
6) 346 × 5 = 1,730
no
8.
yes
7) 511 × 5 = 2,558
8) 187 × 5 = 939
9.
yes
10.
9) 10 × 736 = 7,360
10) 10 × 400 = 4,000
yes
11.
11) 5 × 190 = 950
12) 398 × 2 = 797
no
12.
no
13.
13) 163 × 10 = 1,638
14) 329 × 5 = 1,647
no
14.
15) 5 × 361 = 1,805
16) 202 × 2 = 405
yes
15.
no
16.
17) 2 × 720 = 1,440
18) 10 × 211 = 2,118
yes
17.
19) 356 × 5 = 1,780
20) 262 × 2 = 525
no
18.
yes
19.
no
20.
1-10 95 90 85 80 75 70 65 60 55 50
1
Math
11-20 45 40 35 30 25 20 15 10 5
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