10.10.10 brain teasers

10.10.10 Brain Teasers brought to you by www.makingmathmorefun.com www.math-board-games.com

10.10.10 Brain Teasers

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Copyright 2010 Teresa Evans.

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by Teresa Evans

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Make 10 Again

Fill in the boxes with these digits to make a true

equation 4, 6, 7, 8.

x - x = 10

Make 10

Fill in the boxes with these digits to make a true

equation 0, 6, 7, 7, 7, 9.

1 0

-


4, 5, 6, 7

Write as many equations as possible that equal 10 and

use the numbers 4, 5, 6 and 7.

An incorrect attempt would be

4 x 6 5 7 = 12

2, 3, 4, 5

Write as many equations as possible that equal 10 and

use the numbers 2, 3, 4 and 5.


2 x 3 4 + 5 = 7


Five 10s

Write an equation with five 10s that equals 89.


10 x 10 10 10 + 10 = 90

Five 5s

Write an equation with five 5s that equals 10.

Heres how you might do this with five 4s.

44 4 4 4 = 10

(Do this without replacing the 4s in the above equation with 5s. Find

a different way to do it. )


Starting Number

What number did I start with if I

multiply it by 10,

subtract 10,

divide by 10 and end up with 27.

Ten Weeks

How many minutes are there in 10 weeks?


AnswersAnswersAnswersAnswers Make 10 707 697 = 10

Make 10 Again

6 x 7 8 x 4 = 10

2, 3, 4, 5 (Three possible solutions given) 3 + 5 + 4 2 = 10 3 + 4 + 5 2 = 10 2 X 4 + 5 3 = 10

4, 5, 6, 7 4 + 5 + 7 6 = 10

Five 5s 5 x 5 5 -5 -5 = 10

Five 10s

10 x 10 10 10 10 = 89

Ten Weeks

100,800 minutes

Starting Number 28


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10.10.10 brain teasers

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