IXL | Add and subtract rational numbers: word problems

Andrew mixed 0.7 grams of salt into a pot of soup he was cooking. Before he served the soup, Andrew added 0.2 grams of salt. How much salt did Andrew put into the soup in all?

grams

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Learn with an example

question

Haley filled a measuring cup with 1/2 of a cup of vegetable oil. Then she poured 3/8 of a cup of the oil into a frying pan. How much oil is left in the measuring cup?

Write your answer as a fraction or as a whole or mixed number.

cups

solution

Find the amount of oil left in the measuring cup by subtracting 3/8 from 1/2.

You can use 8 as the common denominator.

Multiply the numerator and the denominator of

by 4 to find an equivalent fraction.

1 × 4

2 × 4

Now subtract the fractions. Subtract the numerators and keep the denominators the same.

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The amount of oil left in the measuring cup is 1/8 of a cup.

Looking for more? Try these:

Lesson: Adding and subtracting rational numbers

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Not feeling ready yet? These can help:

B.6Add and subtract rational numbers

D.2Add and subtract decimals: word problems

G.4Add and subtract mixed numbers: word problems

Lesson: Adding and subtracting rational numbers

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