Math Drills

Adding and Subtracting Decimals Review

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Word Problems (Addition)

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What this worksheet covers

Grade: Grade 4 (Elementary School)
Topic: Adding and Subtracting Decimals

The structure of decimals, down to the tenths, hundredths and thousandths place, is grasped through Place Value and Definition, Comparing Sizes and Number Line. Addition and subtraction follow in column and horizontal form, extending to sums and differences of three numbers and to Removing Trailing Zeros.

Where the two numbers have different numbers of decimal places, the standard error in subtraction is copying the digit above straight down rather than filling the empty place with 0. An answer of 2.44 for 3.6 - 1.24 means the 4 in the hundredths place was copied down. Finishing without writing the decimal point, as though the answer were a whole number, also persists.

The number of decimal places in play widens sharply here. Decimals in grade 3 stopped at a single carry, but this unit reaches the thousandths place and pairs numbers with different digit counts against each other. Lining up the decimal point to add or subtract carries forward as the key to placing it correctly once Multiplying and Dividing Decimals begins.

Addition · Word Problems3 questions
Subtraction · Word Problems3 questions

Questions & answers

Problems and answers on this worksheet

These are the problems in “Adding and Subtracting Decimals”, shown with their answers.

(1)On the morning of sports day, Cordelia's water bottle had 2.13L of water in it. When 3.46L more was added, how many L of water were there? Answer □
Answer: 5.59L
(2)For making sweets, Olivia's house had 0.21kg of sugar. When 0.56kg more was bought at the store, how many kg were there in all? Answer □
Answer: 0.77kg
(3)In a marathon, Chloe ran 5.4km along the road. When she runs 1.36km more, how many km will she have run in total? Answer □
Answer: 6.76km
(4)Farmer Sam had 2.68L of freshly milked milk. After a customer drank 1.34L, how many L will be left? Answer □
Answer: 1.34L
(5)Grandpa's house had 3.412L of soy sauce. They used 1.756L to make tasty oden. How much is left, in how many L? Answer □
Answer: 1.656L
(6)There was 3.45L of vegetable oil in the kitchen. 1.2L was used for frying. How much is left, in how many L? Answer □
Answer: 2.25L

What to do next

Structure of DecimalsStructure of Decimals Reading (Place Value)

Next unit: Division by 2-Digit Numbers

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