Grade 4 · Year 5 · Class 4 · ages 9–10 · Number sense
Estimate sums and differences: Grade 4 practice
Rounding each number first to estimate an answer quickly. Eight questions at a time, instant feedback and a mastery score from 0 to 100.
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Right answers raise your mastery score (more on harder questions) and wrong ones lower it a little. Your best score is saved on this device, and in your account if you log in.
The idea in one minute
Round each number to the place the question names, then add or subtract the rounded numbers in your head.
Try these on paper first
One question at each level. Tap a question to see the answer.
Easy Estimate 9,329 + 7,306 by rounding each to the nearest thousand:
Answer: 16000
Medium Estimate 7,536 + 1,748 by rounding each to the nearest thousand:
Answer: 10000
Challenge Estimate 8,480 + 6,407 by rounding each to the nearest thousand:
Answer: 14000
More ways to practise estimate sums and differences
- Printable estimate sums and differences worksheet with an answer key (new questions every time)
- All Grade 4 practice · Number sense worksheets
Related skills
- Factors and multiples (Grade 4)
- Roman numerals (Grade 4)
- Comparing large numbers (Grade 4)
- Rounding to the nearest 100 (Grade 3)
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FAQ
Estimate sums and differences: questions
What grade is estimate sums and differences?
It is usually taught in Grade 4 (Year 5 in England, Class 4 in India, ages 9–10), though schools and countries differ. Try the grade above or below if it feels too hard or too easy.
What does a estimate sums and differences question look like?
For example: "Estimate 7,536 + 1,748 by rounding each to the nearest thousand:" The answer is 10000. Round each number to the place the question names, then add or subtract the rounded numbers in your head.
What should I learn before and after estimate sums and differences?
Before it, try roman numerals (Grade 4). After it, move on to comparing large numbers (Grade 4).
How can I get better at estimate sums and differences?
Round each number to the place the question names, then add or subtract the rounded numbers in your head. Practise a little every day, read the hint after each wrong answer, and use the printable worksheet when you want to write it out.
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