Question

Which number is a reasonable estimate for 39x24?

Answer 1

1000

Explanation:

4*2 = 8

40 * 20 = 800

4*5 = 20

40* 5 = 200

40 * 20 + 40 * 5 = 800 + 200 = 1000

40 * 25 = 1000

Answer 2

800

Explanation:

I rounded 39 to 40 and 24 to 20 to get numbers that are eadult multiplied

then we can do 40*20 which is 800 using mental math

hope this helps <3