tricky but simple math!

what is 1200 divided by 40

• 25

• 40

• 30

• 15

what is 9+0 then divided by 3 +6-9?

• 9

• 7

• 5

• 0

what is 35 times 35 (dont use calculator)

• 1225

• 1345

• 1725

• 1700

what is 40/50 times 100 %

• 70%

• 50%

• 80%

• 10%

what is the area of a circle when the diameter is 10cm and pie is 3.14?

• 314cm square

• 78.5 cm square

• 78.5cm

• 314

what is 3b-6+4b when b=2

• 7b-6

• 68

• 8

• 17