# Confused when to use equal "=" or arrow "-->"

Since we start to learn about addition and subtraction, the equal sign, =" comes in.

E.g. 2 + 1 = 3 , 5 - 1 = 4

**This equal sign, = **follows us through the start of learning problems sums to **represent units**.

E.g. Ben has two times as much money as Alan. Alan has $10. How much does Ben have?

1 unit = $10

2 units = 2 x $10

= $20

The word 'unit' must be spelt in full instead of using the letter 'u'.

Do not use 1 unit --> $10.

**This arrow sign --> means "implies"**

Arrow sign are used in P5 topics like Percentage and Rate and not other situation.

E.g. Percentage

50% of a shirt --> $200

1% of a shirt --> $4

100% of a shirt ---> $400

NOT 50% of a shirt = $200

E.g. Rate

2 painters --> 10 hours

1 painter --> 5 hours

NOT 2 painters = 10 hours

Hope you are no longer confused in showing your workings during problem sums!