GRADE 9 MENTAL MATH

1
GRADE 9 MENTAL MATH

• Chapter 1 Warm Up

2
Evaluate
3
Evaluate
4
Evaluate

• 20 of 250

5
Evaluate

• 125 of 80

6
Evaluate

• 1/3 x 60 x 1/2

7
Evaluate
8
Evaluate
9
Evaluate
10
Evaluate
4 x 72 3 x 72 (-7) x 72
11
Evaluate
12
Choose the best estimate
gt2 or lt2
13
Choose the best estimate
gt 18 or lt18
14
Choose the best estimate
312 is what percent of 610

• 49 B. 51
• C. 40 D. 60

15
Choose the best estimate
What is the area of a triangle that has a base of
31 cm and height of 73 cm ?

• 100 cm2 B. 2100 cm2
• C. 50 cm2 D. 1100 cm2

16
Choose the best estimate
What is the area of a circle that has a radius of
21 cm2

• 120 cm2 B. 1400 cm2
• C. 4800 cm2 D. 70 cm2