# Maths unit 2 revision guide !

covers everything in topic 2 maths edexcel

- Created by: josie smith
- Created on: 13-04-11 13:03

First 122 words of the document:

Negative numbers

When +/-

This is basically the reverse of what it is :

Adding a negative subtracting it

Subtracting a negative adding it

When Multiplying

Positive × positive = positive

Negative × negative = positive

Positive × negative = negative

Negative × positive = negative

If the signs are the same, the answer is positive. If the signs are different, the answer is negative.

X'S AND /

To calculate 158 × 67:

1. First, multiply by 7 (units):

158

x 67

____

1106

2. Then add a zero on the right-hand side of the next row. This is because we want

to multiply by 60 (6 tens), which is the same as multiplying by 10 and by 6.

Now multiply by 6:

158

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