Mental Math Week 3 B

1
Mental MathWeek 3 B
2
1.
5.5 x 5
3
2.
4
3.

5
4.
120 x 120
6
5.
0.76 x 2.3 x 0
7
6.
8
7.
-13 - (-8)
9
8.
-2.8 - 8.2
10
9.
11
10.
12
11.
Insert the symbol, lt or gt , that makes the
statement true.
-0.6
13
12.
lt or gt
14
13.
Choose the best answer.
What is the circumference of a circle that has a
diameter of 80 cm?
a)350 cm b) 200 cm c) 300 cm d) 250 cm
15
14.
Choose the best estimate.
What is the radius of a circle that has an area
of 21 cm2?
a) 63 cm b) 11.5 cm c) 2.5 cm d) 400 cm
16
15.
Choose the best estimate.
What is the volume of a cube that has edges of
length 4 cm?
a) 16 cm3 b) 32 cm3 c) 64 cm3 d) 128 cm3
17
16.
18
Answers
1.
9.
2.
10.
11.
3.
12.
4.
13.
5.
14.
6.
15.
7.
16.
8.