Max Maths, Year 5, Learn together, Rounding off decimals (1)

The 'Max Maths, Year 5' educational material presents a lesson on rounding off decimals, which is a fundamental concept in mathematics. The lesson starts by revisiting the basic rule for rounding numbers: if the digit to be rounded is 5 or more, the number is increased to the next value (raise the score), while if it's 4 or less, the number remains unchanged (let it rest). This catchy mnemonic helps students easily remember the rule for rounding.

For practical application, the lesson provides an example of rounding off to the nearest ten using the number 155. Since the digit in the ones place is 5, the number is rounded up to 160. The lesson then explains that the same method applies when rounding decimals. To round the decimal 13.4 to the nearest whole number, students look at the digit in the tenths place, which is 4. Following the rounding rule, since it's less than 5, the number is rounded down, resulting in an approximate value of 13.