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PROBLEM SOLVING 033
Subtraction
[one] George earned $2.00 by delivering newspapers. He spent
$0.50 on 2 used comics. He also gave $1.50 to his sister so she could go
to a magic show. Next, George decided to count how much money he had left.
How much money did George have left?
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[two]
Sally was travelling from her school to her house. The distance between
her school and her house is 7km. She had already walked 2.5km, so how much
further did she have to walk?
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[three]
Ann enjoyed playing marbles because she was a very skilful player.
Unfortunately, she had three bad games one day. In the first game, she
lost 8 marbles. In the second game, she lost 23 marbles, and then she lost
11 more marbles in the last game. If she started with 113 marbles, how
many did she have left after those three games?
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[four]
Brian had a year to complete an important project. After 3 months, he
hadn't started yet. After another month, he still hadn't started. How long
did Brian have left to finish his assignment?
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[five] Toby and Sue were looking forward to Christmas. If
the date was November 9th, how many days were there until Christmas?
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First, you need to add up all the marbles Ann lost.
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You subtract the distance she
has travelled from the total
distance she has to travel.
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56 - 25 = answer
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Ann started with 113 marbles, so
the equation to solve this problem is: 113 - 42 =
answer
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A year =
12 months.
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8 + 23 + 11 = the amount you must
subtract from the total number of marbles she started with.
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First you must add up the months
Brian has lost. You then subtract this answer from the total number of months he
started with.
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3 months + 1 month = 3 + 1 = 4
months LOST.
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12 months (1 year) - 4 months =
answer
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George used $2.00. You now
subtract $2.00 from $2.00
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Christmas is on the 25th of
December. There are 31 days in November.
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There are a few ways to do this,
but here's one.
Add up the total number of days in November (31) and the
number of days in December until Christmas (25).
This means an equation like this: 31 + 25 = 56
Now you subtract the starting date (25th) from this total.
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First, you need to add up what George has used (spent and gave
away).
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7km - 2.5km =
answer.
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$0.50 + $1.50 = the amount you must subtract from $2.00
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