by Kellie B
(Ann Arbor, MI)
Johnny works at a local bakery. In the morning Customer #1 buys 1/2 a pan of brownies. Later, Customer #2 buys 1/4 of the remaining brownies. The brownies cost $10 for a whole tray.
How much did Customer #1 pay for his brownies? ___________
What fraction of a pan did Customer #2 buy? _______________
How much did Customer #2 pay for his brownies? ___________
Solution
Customer #1
Customer #1 bought half or 1/2 of the whole tray.
The tray cost 10. Half of 10 is 5
Another way to do the computation is to do
1/2 × 10 = (1 × 10) / 2 = 10 / 2 = 5
Customer #1 paid 5 dollars for his brownies
Customer #2
Customer 2 bought 1/4 of the remaining brownies.
The remaining brownies is 1/2
Thus, customer #2 bought 1/4 of 1/2
1/4 of 1/2 = 1/4 × 1/2
= (1 × 1) / (4 × 2)
= 1 / 8
Customer #2 bought 1/8 of the brownies
The fraction of a pan Customer #2 bought is 1/8
Customer #2 only bought 1/8 of the brownies.
So just find out what 1/8 of 10 is
1/8 of 10 = 1/8 × 10
1/8 × 10 = ( 1 × 10 ) / 8 = 10 / 8 = 1.25
Customer #2 paid 1.25 dollar for his brownies?
Nov 15, 18 05:01 PM
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Nov 15, 18 05:01 PM
Modeling multiplication with number counters - Learning multiplication is fun!
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