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0.4 + 0.3 = 0.7
- A short, 2-minute Session
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Decimals · SumNinja
Decimal math games
Get comfortable calculating with tenths and hundredths through short rounds of decimal questions.
Play now Choose a different mode2-minute Session · Free · No sign-up
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What is 0.4 + 0.3?
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Use the same addition fact as 4 + 3.
Choose an answer when you’re ready.
See the answer and why
0.7
Four tenths plus three tenths makes seven tenths.
How Decimals practice works
The digits after the decimal point show parts of a whole. Keep their place value in mind as you add, subtract, multiply or divide. Start a two-minute Session with decimal questions.
Keep track of the size of each part
Add or take away parts of the same size. When you multiply or divide, check how the size changes. Multiplying by a number below one can make the answer smaller.
See how it works
0.4 + 0.3 = 0.7
Four tenths plus three tenths makes seven tenths. This uses the same addition fact as 4 + 3 = 7.
0.6 × 0.4 = 0.24
Six tenths times four tenths makes twenty-four hundredths. The result is smaller than 0.6 because you are taking only four tenths of it.
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