Number Theory

Lesson

We discussed what square numbers are in What's So Special? Remember these are numbers that are multiplied by themselves.

We can square any number.

$12^2=12\times12$122=12×12 $=$= $144$144

$100^2=100\times100$1002=100×100 $=$= $10000$10000

Cube numbers are numbers that are multiplied by themselves two more times. (that number three times in total)

$2^3=2\times2\times2$23=2×2×2 $=$= $8$8

$5^3=5\times5\times5$53=5×5×5 $=$= $125$125

Evaluate $8^2+7$82+7

Evaluate $12^2-9^2$122−92

Evaluate $5^3+3^2$53+32