Magoosh Shortcuts

Question 1

Squaring a multiple of 10

Answer 1

square the nonzero part

tack on 2 0s

ex: 70² = 49…4,900

Question 2

Squaring numbers ending in 5

Answer 2

• multiply the first number(s) by that number+1
• tack on 25 (5²)
  ex: 45²

4 x 5 = 20

2,025

Question 3

Squaring a number that is +/- 1 of a number who’s square you already know

Answer 3

n² + n + (n+1) = (n+1)²

or minus

ex: 86²

85²=7225

7225 + 85 +86 = 7396

Question 4

Easy way to divide a number by five

Answer 4

Double then divide by 10

Question 5

When multiplying like signs (+/-) the result is

Answer 5

positive

Question 6

When we multiply unlike signs the result is

Answer 6

negative