Addition of positive and negative integers | Maths | Quizalize & Oak National Academy

Starter quiz

Select all the integers.

-44 ✓

-4.4

0 ✓

4 ✓

44.4
Select all of the correct statements.

-2 < -3

-3 < -2 ✓

-2 > -3 ✓

-5 > -6 ✓

-6 > -5
Starting with the lowest temperature, put these temperatures in order from coldest to warmest.

1

⇔

${-8}^\circ \text{C}$

2

⇔

${-6}^\circ \text{C}$

3

⇔

${-2}^\circ \text{C}$

4

⇔

${0}^\circ \text{C}$

5

⇔

${2}^\circ \text{C}$

6

⇔

${6}^\circ \text{C}$
The temperature in Reykjavik is ${-5}^\circ \text{C}$ . It is ${3}^\circ \text{C}$ warmer in Paris. What is the temperature in Paris?

${-8}^\circ \text{C}$

${-3}^\circ \text{C}$

${-2}^\circ \text{C}$ ✓

${2}^\circ \text{C}$

${3}^\circ \text{C}$
Andeep has a balance of £1.50 at the school canteen. He buys a sandwich for £2.10, an apple for 25 p and some fruit juice for £1.15. What is Andeep's new balance?

£2

£1

£0

-£1

-£2 ✓
A submarine is 200 metres below sea level. The submarine rises 150 metres and then dives down 300 metres. The submarine is now ______ metres below sea level.

'350' ✓

Match together each number with its additive inverse.

-3

⇔

3 ✓

4

⇔

-4 ✓

-1

⇔

1 ✓

2

⇔

-2 ✓
Which integer does this set of counters represent?

(-11)

(-3) ✓

(-2)

3

11
Work out: 5 + (-4) = ______

'1' ✓
Work out (-3) + (-2)

5

1

(-1)

(-5) ✓
Starting with the calculation with the lowest answer, sort these calculations in order of size from lowest answer to highest answer.

1

⇔

(-2) + (-4)

2

⇔

(-3) + (-1)

3

⇔

2 + (-2)

4

⇔

3 + (-2)

5

⇔

(-1) + 5
Work out: 7 + (-14) + 12 + (-8) = ______

'(-3)' ✓

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It can help to think of a context when doing a calculation.
Addition of negative integers can be made easier by considering zero pairs.
Addition of large negative integers can be made easier using partioning to make zero pairs.

That addition will always make the result bigger.

If pupils are struggling with the concept that adding can make an integer smaller encourage them to use counters and form zero pairs.

Additive inverse - The additive inverse of a number is a number that, when added to the original number, gives the sum of 0.
Zero pair - A number and its additive inverse make a zero pair.
Absolute value - 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