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Addition
Subtraction
Multiplication
Division
Brain Teaser
100
8.6+2.4
11
100
2.23-0.11
2.12
100
0.6 X 2
1.2
100
20 ÷ 2
10
100
What has hands, but can not clap?
a clock
200
23.5+1.9
25.4
200
11.8-8.82
2.98
200
0.8 X 0.4
0.32
200
2.0 ÷ 0.02
100
200
Say Racecar backwards.
Racecar backwards
300
864.23+0.158
864.388
300
5-4.73
0.27
300
0.006 X 0.07
0.00042
300
3.45 ÷ 0.3
11.5
300
I am an odd number. Take away one letter and I become even. What number am I?
Seven (Take away the 'S', then it becomes 'even')
400
94.17+65.702
159.872
400
38.5-36.45
2.05
400
12.5 X 0.05
0.625
400
23.64 ÷ 0.008
2955
400
Using only addition, how do you add eight 8’s and get the number 1000?
888+88+8+8+8
500
897.433+15.0036
912.4366
500
47.4-18.869
28.531
500
0.34 X 0.26
0.0884
500
I bought a pizza for $798.56 for my class. There are 31 of us, then how much does each person need to pay for the pizza?
$25.76 each
500
Say "A big bug bit the little beetle but the little beetle bit the big bug back." correctly. Every single person has to say it correctly!
A big bug bit the little beetle but the little beetle bit the big bug back. blah blah blah