AC9M7N05Year 7NumberPractised on site

AC9M7N05 — Year 7 Number

Official Curriculum Content Description:

round decimals to a given accuracy appropriate to the context and use appropriate rounding and estimation to check the reasonableness of solutions

Worked Examples (1)

Example 1Decimal Rounding & Significant Contexts

A digital scale at a market measures a parcel of fruit as

2.150\text{ kg}

. Round the mass to 1 decimal place.

Common mistake: Truncating the decimal digits without rounding up when the next digit is 5 or greater.

Correct Answer:

2.2

Worked Solution:

1. Look at the digit in the next decimal place (the test digit):

5

. 2. Since

5 \ge 5

, round up. 3. The rounded value is

2.2\text{ kg}

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