Adding and subtracting decimals worksheets with an answer key, made to order. Choose tenths, hundredths or thousandths, addition, subtraction or both on one sheet, and whether the numbers have the same number of decimal places or students have to line them up first.
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Decimals
Facts to 20
Fact strategies
Addition
Bigger addition
Subtraction
Across zeros
Mixed
Missing numbers
Adding decimals: tenths. Tenths with up to two whole digits.Adding decimals: hundredths. Hundredths, the points lined up.Subtracting decimals: hundredths. Hundredths, the larger number on top.Adding and subtracting decimals. Tenths and hundredths together, both operations.Line up the decimal points. Copy each problem into the grid, then solve.Addition within 10. Sums up to 10, set in columns.Addition within 20. Sums up to 20, set in columns.Subtraction within 10. Starting numbers up to 10.Subtraction within 20. Starting numbers up to 20.Addition and subtraction within 20. Both operations on one sheet. Watch the signs.Adding three numbers. Three one-digit numbers across the line.Adding 9. Every problem adds 9, sums up to 20.Doubles. Doubles facts up to 10 + 10.Make 10. Find the number that makes 10.Two-digit plus one-digit addition. A two-digit number and a one-digit number.Two-digit addition, no regrouping. No column adds to ten or more.Two-digit addition. Two-digit numbers, regrouping as it comes.Two-digit addition with regrouping. Every problem regroups at least once.Two-digit addition, regrouping in every column. The ones and the tens both regroup.Three-digit plus two-digit addition. A three-digit and a two-digit number.Regrouping in the tens. Three-digit addition that regroups in the tens only.Three-digit addition with regrouping. Every problem regroups at least once.Four-digit addition with regrouping. Four-digit numbers, regrouping at least once.Column addition: four numbers. Four two-digit numbers in a column.Two-digit subtraction, no borrowing. Each top digit is the larger.Two-digit subtraction. Two-digit numbers, the larger on top.Three-digit subtraction, no zeros to cross. Each problem borrows; no zero in the way.Four-digit subtraction. Four-digit numbers, the larger on top.Subtracting across a zero. Three-digit numbers with a zero to work across.Subtracting across two zeros. Four-digit numbers like 5,002 − 1,348.Subtracting from round numbers. Starting from whole hundreds, like 600 − 89.Three-number subtraction. Take two numbers away, one after the other.Two-digit addition and subtraction. Both operations on one sheet. Watch the signs.Three-digit addition and subtraction. Three-digit numbers, both operations.Missing addends within 20. Find the number that completes each sum.Two-digit missing addends. Two-digit sums with one addend hidden.Missing numbers, adding and subtracting. Any number can be the missing one, within 20.Missing digits. Find the hidden digits in each problem.
Make your own adding and subtracting decimals worksheet
Title and instructions
Left empty, the sheet is titled "Adding and Subtracting Decimals — Hundredths, Uneven Places".
Adding and subtracting decimals works exactly like adding and subtracting whole numbers, as long as each digit sits in the right place value column. The rule that makes this happen is simple: line up the decimal points, one above the other, and the tenths, hundredths and thousandths fall into place under each other. The decimal point in the answer goes straight down from the points above it.
Placeholder Zeros
When the numbers have different numbers of decimal places, as in 4.5 + 2.37, students can write a zero at the end of the shorter number: 4.50 + 2.37. The zero does not change the value, but it fills the empty column so nothing is skipped. Placeholder zeros matter most in subtraction, where 6.2 − 3.45 needs a digit to borrow from in the hundredths column: 6.20 − 3.45.
Check by Estimating
Before working a problem, round each number to the nearest whole number and add or subtract those. 4.5 + 2.37 is about 5 + 2, so the answer should be close to 7. If the worked answer is 0.682 or 68.2, a decimal point is in the wrong place. Estimating first catches most decimal point mistakes before they reach the answer key.
