Math Drills
Adding and Subtracting Decimals Review
D-3Calculation (Addition and Subtraction of 3 Numbers)
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What this worksheet covers
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.
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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.
- Adding and Subtracting 3 Numbers · Same Operation8 questions
- Adding and Subtracting 3 Numbers · Mixed Operations6 questions
- Adding and Subtracting 3 Numbers · Removing Trailing Zeros6 questions
Questions & answers
Problems and answers on this worksheet
These are the problems in “Adding and Subtracting Decimals”, shown with their answers.
(1)2.56 + 6.48 + 0.27 = □
Answer: 9.31
(2)5.45 + 1.31 + 0.77 = □
Answer: 7.53
(3)5.62 + 5.53 - 9.63 = □
Answer: 1.52
(4)9.42 - 2.01 - 3.69 = □
Answer: 3.72
(5)2.5 + 7.5 - 3 = □
Answer: 7
(6)2.9 + 0.52 + 3.88 = □
Answer: 7.3
(7)5.27 + 0.43 - 2.5 = □
Answer: 3.2
(8)8.7 - 6.3 + 5.2 = □
Answer: 7.6
(9)9.3 + 6.7 + 1.5 = □
Answer: 17.5
(10)5 - 1.45 - 1.95 = □
Answer: 1.6
(11)7.59 - 4.49 - 1.77 = □
Answer: 1.33
(12)9.6 + 2.3 - 3.4 = □
Answer: 8.5
(13)4.27 - 1.45 + 2.13 = □
Answer: 4.95
(14)6 + 9.8 + 8.3 = □
Answer: 24.1
(15)6.45 - 2.18 + 0.83 = □
Answer: 5.1
(16)9 - 2.16 - 3.45 = □
Answer: 3.39
(17)6.77 + 3.51 - 7.97 = □
Answer: 2.31
(18)5.4 + 3.7 + 9.6 = □
Answer: 18.7
(19)9.56 + 7.78 - 7.71 = □
Answer: 9.63
(20)11 - 3.5 - 1.5 = □
Answer: 6
What to do next
More worksheets in this unit
Structure of DecimalsStructure of Decimals Reading (Comparing Size)
Structure of DecimalsStructure of Decimals Reading (×10 and 1/10)
Structure of DecimalsStructure of Decimals Reading (Number Line)
Adding DecimalsAdding Decimals Column Calculation (Carrying)
Adding DecimalsAdding Decimals Column Calculation (Mismatched Digits)
Adding DecimalsAdding Decimals Column Calculation (To the 3rd Place)
Adding DecimalsAdding Decimals Calculation (Basics)
Adding DecimalsAdding Decimals Calculation (Different Digit Counts)
Adding DecimalsAdding Decimals Fill in the Blank
Adding DecimalsAdding Decimals Word Problems
Subtracting DecimalsSubtracting Decimals Column Calculation (Borrowing)
Subtracting DecimalsSubtracting Decimals Column Calculation (Mismatched Digits)
Subtracting DecimalsSubtracting Decimals Column Calculation (To the 3rd Place)
Subtracting DecimalsSubtracting Decimals Calculation (Basics)
Subtracting DecimalsSubtracting Decimals Calculation (Different Digit Counts)
Subtracting DecimalsSubtracting Decimals Fill in the Blank
Subtracting DecimalsSubtracting Decimals Word Problems
Adding and Subtracting 3 NumbersAdding and Subtracting 3 Numbers Calculation (Same Sign)
Adding and Subtracting 3 NumbersAdding and Subtracting 3 Numbers Calculation (Mixed Signs)
Adding and Subtracting 3 NumbersAdding and Subtracting 3 Numbers Calculation (Removing Trailing 0s)
Adding and Subtracting 3 NumbersAdding and Subtracting 3 Numbers Fill in the Blank
Adding and Subtracting Decimals ReviewAdding and Subtracting Decimals Review Column Calculation (Addition)
Adding and Subtracting Decimals ReviewAdding and Subtracting Decimals Review Column Calculation (Subtraction)
Adding and Subtracting Decimals ReviewAdding and Subtracting Decimals Review Calculation (Addition)
Adding and Subtracting Decimals ReviewAdding and Subtracting Decimals Review Fill in the Blank
Adding and Subtracting Decimals ReviewAdding and Subtracting Decimals Review Word Problems (Addition)
