Choosing Numbers That Make Sense - Challenge Math Worksheet With Answer Key Page 2
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1
2Name
9–8
Choosing Numbers that
Make Sense
Complete the problem using decade numbers.
Add or subtract to solve.
Possible answers shown.
Write the equation.
40
50
1.
2.
Chris collects
stones.
Olivia has
pens. She
10
30
There are
gray stones.
collects
more pens
10
10
There are
brown
but she loses
pens.
stones. The rest are white.
How many pens does Olivia
How many stones are white?
have in all?
40 – 10 – 10 = 20
50 + 30 – 10 = 70
70
20
pens
white stones
40
70
3.
4.
Henry has
blue
Lily picks
blueberries
20
marbles. Then he gets
and
strawberries.
30
30
more blue marbles
She eats
berries.
90
as a present. He has
How many berries does
marbles in all. How many
she have left?
marbles are not blue?
90 – 40 – 30 = 20
70 + 20 – 30 = 60
20
60
marbles
berries
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