**In this module, you can ****study how to add and subtract integers.**

** **

You add and subtract with negative numbers in everyday life when you estimate changes in temperature and bank balances.

**Examples**

10 + -5 = 5 This is the same as 10 - 5 = 5

-10 + -5 = -15 This is the same as -10 - 5 = -15

**In these last examples, two 'minus' signs are side by side. In this case the two signs make a positive.**

-10 - -5 = -5 This is the same as -10** +** 5 = -5

10 - -5 = 15 This is the same as 10** +** 5 = 15

**Be careful when using a basic calculator **for these types of questions. You need to learn the rules first for adding & subtracting integers.

Ideally, use a calculator that has brackets and enter the equations like this:

(-10) - (-5) =

**Study and practice**

0.00 min addition (+), subtraction (-), multiply (x), divide (÷)

1.19 min decimal point

2.43 min C, CE and backspace

4.19 min square, square root & fractions

6.17 min percentage (%)

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