Study Notes 1.3: Approximation (≈)

– Approximation means rounding off.

There are two ways to round off a number;

– Round up

– Round down


When rounding off a number;

1.According to the question, if the number you are rounding is followed by a number from 5 to 9, round the number up.

Round 5291 to the nearest hundred: 5291 ≈ 5300

2. According to the question, if the number you are rounding is followed by a number from 1 to 4, round the number down.

Round 5231 to the nearest hundred: 5231 ≈ 5200


E.g. Round off the numbers 1234 and 1267 to the nearest 10.

1234 ≈ 1230

Since 3 is less than 5, we round down the number.

1267 ≈ 1270

Since 6 is more than 5, we round up the number.

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