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Mental Math
Simple math problems to enhance number sense
100
Mathematics
8th Grade
08/29/2013
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Cards

Term
m + 54 = 82
 Definition
m = 28
Term

7   +    5

    12   +  12    

Definition
1
Term
0.5 + 0.3 =
 Definition
0.8
Term
16 x 4
 Definition
64
Term

Find the perimeter of a rectangle with the given length and width.

L = 12 cm W

= 10 cm

 Definition
48 cm
Term
(76 + 24) ÷10 =
 Definition
10
Term
Round 836 to the nearest ten?
 Definition
840
Term

The product of 4 and 12 is divided by some number to get an answer of 3. What is the number?

 Definition
16
Term

7   +   7

12   +   12

 Definition

7

6
Term
1.5 + 0.3 =
 Definition
1.8
Term
25 x g  = 75
 Definition
g = 3
Term

Find the area of a rectangle with the following dimensions.

L = 12 cm W

= 10 cm

 Definition
120 cm2
Term
46 + 8÷ 4 + 6 =
 Definition
54
Term
11 x 700
 Definition
7700
Term

Which fraction is smaller?  

  1         1             1

10        5              8

 

 Definition

1

10
Term

9

      10   x 5

 Definition
4.5 or 9/2
Term

Compare

7        3

10      4

 Definition
<
Term

An isosceles triangle with a base of 6 cm has a perimeter of 30 cm. How long are each of the other two sides?

 Definition
12 cm
Term
(10 + 2) ÷ (6 - 3) =
 Definition
4
Term

8    -    2

15        15

 Definition

2

5
Term
What is sum of all the interior angles in a triangle?
 Definition
180o
Term
21 - 6 x 3
 Definition
3
Term

If you toss a fair coin 250 times, about how many times should it land on tails?

 Definition
125 times
Term
Which is greater 1/2 or 0.55?
 Definition
0.55
Term
What is 2/5 written as decimal?
 Definition
0.4
Term
Give two other forms of the fraction 6/4
 Definition
3/2 and 1 1/2
Term
120 - b = 102
 Definition
b = 18
Term
23 - (6 + 2)÷2
 Definition
19
Term
Find the area of a square where one side is 4 meters
 Definition
16 m2
Term
What is 1/2 of 1200?
 Definition
600
Term
Divide 100 by 10 , add 3, subtract 7 and multiply by 2.
 Definition
12
Term
8.51-3.2=
 Definition
5.31
Term
6 x (100 - 86) =
 Definition
84
Term

Which number is not prime?

2, 3, 8

 Definition
8
Term

3    x   7

7       10

 Definition

3

10
Term

If a coach estimates that each football player will eat

3/4 of a pizza, how many should he order to feed 16 players?

 Definition
12
Term
9+2x5+6
 Definition
25
Term
What is the product of 8, 0, 5, and 6?
 Definition
0
Term
9 + 6 - 4x3 +12
 Definition
15
Term

Reduce

8

24

 Definition

1

3
Term

Reduce

50

60

 Definition

5

6
Term

Reduce

10

15

 Definition

2

3
Term
(-1)10
 Definition
1
Term
(-3)3
 Definition
-27
Term
42
 Definition
16
Term
-42
 Definition
-16
Term

Round to tenth

5.2471

 Definition
5.2
Term

Round to thousandth

1.3697

 Definition
1.370
Term

Round to hundredth

7.8895

 Definition
7.89
Term

  3          

8  x 8  

 

 Definition
3
Term

2       

9 x 18

 Definition
4
Term

3          

5    x 10

 Definition
6
Term
8.25 x 1
 Definition
8.25
Term

Compare <, > or =

5.25       5.225

 Definition
>
Term

Compare <,> or =

0.146      0.14

 Definition
>
Term

Compare <, > or =

-7.8     -7.7

 Definition
<
Term

Compare <,> or =

3/4     75%

 Definition
=
Term
(-1)(-1)
 Definition
1
Term
(-1)(-1)(-1)
 Definition
-1
Term
3 - -8
 Definition
11
Term
0 - (-2)
 Definition
2
Term
-3 - 6
 Definition
-9
Term
-11 - (-11)
 Definition
0
Term
6 -13
 Definition
-7
Term
-8 - 21
 Definition
-29
Term
-7 - (-10)
 Definition
3
Term
-112 + 112
 Definition
0
Term

Which is greater ?

5     7

8    16

 Definition

5

8
Term

What is the perimeter of a square with each side 12 meters long?

 Definition
48
Term
6 x 2 - 8÷4
 Definition
10
Term

Write the fraction as a percent

1

10

 Definition
10%
Term

Write the fraction as a percent

3

4

 Definition
75%
Term
2 x 7 + 32 ÷ 9
 Definition
15
Term
64.2 x 100
 Definition
6420
Term
What is the least common multiple of 8 and 10?
 Definition
40
Term
What is the greatest common factor of 18 and 24?
 Definition
6
Term
2 x 7 x 5
 Definition
70
Term
2 x 32 ÷ 9 + 7
 Definition
9
Term

How do you find the area of a rectangle?

 Definition
l x w
Term

Which number is prime?

15, 19, 21

 Definition
19
Term
Write 5% as a decimal
 Definition
0.05
Term
Write 21.5 as a percent
 Definition
2150%
Term
What is the least common multiple of 14 and 21?
 Definition
42
Term
What is the greatest common factor of 50 and 70?
 Definition
10
Term
6 x 3 + 5 x 4 =
 Definition
38
Term
Find the length of a rectangular garden if the area is 72 m2 and the width is 8 m.
 Definition
9 m
Term
Write 1/5 as a decimal
 Definition
0.2
Term
5/12 of 24
 Definition
10
Term

Write the ratio of 6 blackbirds to 8 bluebirds.

 Definition
6  to 8 or 3/4
Term
7 x 4 - 2 ÷ 1 x 6
 Definition
16
Term
3 + 4 x 6 - 3
 Definition
24
Term

Order from least to greatest

1/2, 1, 1/4, 3/4

 Definition
1/4, 1/2, 3/4, 1
Term

2     4

3   x 5

 

 Definition

8

15
Term
6 + 3 + 4 ÷ 2 x 3
 Definition
24
Term
What is 1/3 of 27?
 Definition
9
Term
What is 2/3 of 24?
 Definition
16
Term

Find the least common multiple

12, 8

 Definition
24
Term

Find the greatest common factor

15, 36

 Definition
3
Term

Which number is not prime?

17, 51, 33

 Definition
51
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