Determining Reasonable Answer Worksheet With Answer Key Page 12

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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) 5 × 897 = 4,485
2) 10 × 667 = 6,671
yes
5.
yes
6.
3) 778 × 2 = 1,556
4) 116 × 5 = 580
yes
7.
5) 947 × 2 = 1,894
6) 892 × 2 = 1,784
yes
8.
yes
7) 242 × 5 = 1,210
8) 2 × 836 = 1,672
9.
no
10.
9) 435 × 10 = 4,350
10) 2 × 596 = 1,193
no
11.
11) 5 × 149 = 747
12) 808 × 10 = 8,082
no
12.
no
13.
13) 5 × 800 = 4,001
14) 10 × 741 = 7,410
yes
14.
15) 5 × 183 = 915
16) 2 × 789 = 1,579
yes
15.
no
16.
17) 10 × 195 = 1,950
18) 2 × 167 = 335
yes
17.
19) 985 × 2 = 1,971
20) 10 × 310 = 3,109
no
18.
no
19.
no
20.
1-10 95 90 85 80 75 70 65 60 55 50
6
Math
11-20 45 40 35 30 25 20 15 10 5
0

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