hard math

what is 100 divided by 10

• 10

• 56

• 66

• 50

Lilly has 37 pencils and gave her friend 20 pencils how much pencils Lilly does have now

• 17

• 39

• 40

• 45

96 divided by 8

• 12

• 9

• 34

• 70

65 divided by 5

I have 450,000$ and a laptop costs 70,000$ and i pay for it how much do I have now.

• 45,000

• 90,000

• 34,00

• 380,000

50 plus 40

598 plus 70

709 plus 490

which two addition is the fastest way to calculate mentaly.

70plus 100

50plus20

or

567plus567

456plus789

• 567 plus 567and 456 plus789

• 70 plus100 and 50plus 20