The additive inverse of a number is a number that, when added to the original number, gives the sum of 0.

The absolute value of a number is its distance from zero. E.g. 5 and (−5) are both 5 away from zero and so both have an absolute value of 5.

Subtraction of positive and negative integers

Maths

Pupils use their understanding of place value and fluency with decimals from this unit in order to extend this understanding to fractions.  In the future unit, pupils will be asked to compare and order both fractions and decimals and will assess when conversion is required.

The prior unit on factors, multiples, squares and cubes helped pupils build on their understanding that any positive integer can be expressed as a product of its factors. This skill is used here to explore multiplying and dividing with decimals.

Arithmetic procedures with integers and decimals

Complete the statement. The additive inverse of a number is a number that, when added to the original number, gives the sum of {{ }}.

Match together each of these subtractions with its equivalent addition.

Work out: (-1) + 2 - (-3) - 4 + (-5) = {{ }}

Complete the statement. The missing integer is {{ }}

Complete the statement. The {{ }} value of a number is its distance away from zero.

Which integer does this set of counters represent?

Starting with the calculation with the lowest answer, sort these calculations in order of size from lowest answer to highest answer.

This lesson will soon be taken down.

Subtraction of positive and negative integers

Lesson outcome