Rounding to 10, 100 and 1 000
Rounding to the nearest 10, 100 or 1 000, and estimating to check your answer. Read one part at a time and tap “I know this”. Then test yourself in the quiz.
Know it already? Jump straight to the quiz
Rounding to the nearest 10, 100 or 1 000
- Look at the digit to the right of the place you are rounding to.
- 0, 1, 2, 3 or 4: round down (the digit stays).
- 5, 6, 7, 8 or 9: round up (the digit goes up by one).
- All the digits to its right become zeros.
| Number | Nearest 10 | Nearest 100 | Nearest 1 000 |
|---|---|---|---|
| 4 352 | 4 350 | 4 400 | 4 000 |
| 7 865 | 7 870 | 7 900 | 8 000 |
Estimating
Round first, then calculate: 398 + 512 ≈ 400 + 500 = 900. This tells you roughly what the answer should be.
Remember this and test yourself
- Look at the digit to the right of the place.
- 0 to 4 rounds down; 5 to 9 rounds up.
- The digits on the right become zeros.
- Estimate by rounding first.
Write these points in your book. Read them again the night before the test.
Five or more, raise the score; four or less, let it rest.
Important words
First say the answer yourself, then turn the card over.
Match column A to column B
Tap a word in column A, then its meaning in column B. You can also start in column B.
Now the real quiz!
The quiz has many more questions on this topic. Every question shows straight away whether you are right and explains why.
Take the quiz: Rounding to 10, 100 and 1 000- Let your child work the examples on paper and explain them to you.
- The ticks (“I know this”) are saved on this device only. We never ask for names or emails.
Follows CAPS for Grade 4 Mathematics. Always check your teacher’s notes and textbook too.