Positive and negative numbers.

Wala: Positive and negative numbers.

L.O: Adding and subtracting positive and negative numbers using number line.

Investigate this task ( work in pairs. )

You can subtract any two numbers in any order and get the same answer.

Checklist.

1. I can show my working out.

2. I can do at least 4 different number sentence.

3. I can write down whether it is true or false.

Adding and subtracting positive numbers.

To add and subtract numbers always begin counting from zero.

When adding positive numbers, count to the right.

When subtracting positive numbers, count to the left.

Example.

1) 2 + 3 =

2) 2 - 4

Adding and subtracting negative numbers.

To add and subtract numbers always begin counting from zero.

When adding negative numbers, count to the left.

When subtracting negative numbers, count to the right

Example.

1) -2 + (-2) =

2) -3 - (- 1) =

Remember.

1) Subtract when two different signs appear next to each other.

2) Add when two of the same signs appear next to each other.

Individual work.

1) 2 + 5 =

2) -3 + 4 =

3) -7 - 4 =

4) 9 - - 4 =

5) 6 + - 3 =

NIM page 64 Nos 1 - 8

Ask students these oral questions.