Mental math

What is the average of 21, 17 and 19?

• 19

• 23

• 15

• 16

Round off 94 to the nearest ten.

• 100

• 94

• 90

• 80

Write 0.0019 as a fraction.

• 19/10

• 19/100

• 19/1000

• 19/10000

Write 25% of 80?

• 10

• 20

• 30

• 40

Put in order in descending order, 0.03, 1.23, 1.023, 0.003, 0.303, 0.13

• 1.023, 1.23, 0.303, 0.13, 0.03, 0.003

• 0.13, 0.03, 1.023, 0.303, 1.23, 0.003

• 1.23, 1.023, 0.303, 0.13, 0.03, 0.003

• 1.023, 1.23, 0.13, 0.03, 0.303, 0.003

Name two common factors of 16 and 40 [not including 1].

• 4,5, 8

• 2, 10, 8

• 2, 4, 16

• 2,4, 8

Write 15 minutes to 3 in the afternoon in figures, using am or pm.

• 3:15pm

• 2:45am

• 3:15am

• 2:45pm

What is the missing number? 3.5, 3.0, _____, 2.0

• 1.5

• 0.5

• 2.5

• 4.5

How many obtuse angles are there in rhombus?

• 5

• 4

• 3

• 2

What is two-fifths of the difference between 25 and 35?

• 6

• 5

• 4

• 2