Remember: Say about how much first. Then cut to one bottom (or multiply across), work it out, and check it against your estimate.
Estimate, then work it out
1
Mia puts 11/12 cup of flour in a bowl. Then she adds 1/2 cup more. About how much flour is in the bowl?
about 1/2about 1 1/2about 2 1/2
2
Mia has 3/4 cup of flour. She uses 3/8 cup to bake bread. How much flour is left? cup
3
Mia measures 1/2 cup of flour, then 11/12 cup more. How much flour does she have in all?
12/141 1/121 5/12
4
1/3 + 1/4 = 2/7
TrueFalse
5
5/6 − 1/3 = 1/2
TrueFalse
6
Leo has 2/5 liter of juice. He drinks 3/4 of it. How much juice does he drink? liter
Bigger stories
7
Leo has 7/8 liter of juice. He shares 2/3 of it with a friend. How much juice does he share? liter
8
Ava has 4 1/10 meters of ribbon. She gives 1/2 of it to a friend. About how much ribbon does she give?
about 2about 5about 4 1/2
9
Ava cuts 1/6 meter of ribbon for a bow, then 2 7/12 meters more. How much ribbon does she cut in all?
2 8/182 3/43 1/4
10
Leo has 4 1/3 liters of juice. He drinks 1 1/6 liters. How much is left?
5 1/23 1/33 1/6
11
Join each story to the operation you use.
1Mia pours more flour into a bowl
2Mia uses some of her flour to bake
3Leo drinks 3/4 of his juice
Amultiply
Badd
Csubtract
12
Put the steps for 1/2 + 1/3 in order.
Add the tops: 3 + 2 = 5, so the sum is 5/6
Check that 5/6 is close to the estimate
Cut both fractions into sixths: 3/6 and 2/6
Say about how much: a bit less than 1
13
Mia says 11/12 + 1/2 = 12/14. Use an estimate. Why can't she be right?
12/14 is more than 2.12/14 is less than 1, but 11/12 + 1/2 is more than 1.The bottoms must be added.
14
Write a story problem that 1/2 + 1/4 fits. Solve it, then check it with an estimate.
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