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)To wrap a present, Chloe prepared 3.46m of ribbon. When she joins on 4.18m more of ribbon, how many m will there be in total? Answer □
Answer: 7.64m
(2)At a summer festival, Anna's store had 4.36L of juice. When 0.4L more is stocked, how many L will there be in total? Answer □
Answer: 4.76L
(3)For a science experiment, there was 0.23dL of milk. When the teacher gave 0.45dL more, how many dL were there in all? Answer □
Answer: 0.68dL
(4)Ethan from the craft club has tape that is 7m long. He cut off 2.625m for today's project. How much is left, in how many m? Answer □
Answer: 4.375m
(5)At the school breakfast, there was 7.5L of milk. Everyone drank 3.24L. How much is left, in how many L? Answer □
Answer: 4.26L
(6)Riley's family bought 5.143L of milk. They used 1.567L for cooking. How much is left, in how many L? Answer □
Answer: 3.576L

What to do next

Structure of DecimalsStructure of Decimals Reading (Place Value)

Next unit: Division by 2-Digit Numbers

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