Calculate Intervals Across Zero microlesson
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This lesson is all about calculating intervals around zero. So sometimes we need to find the difference between a positive number and a negative number. To do this, it helps you use a number line. We start by marking both numbers on the number line and then counting between them. So, starting on the negative number, we can first jump to the zero and then from the zero to the positive number. We then add the two jumps together. Let's try finding the difference between 5 and +7. We start on 5 and jump to 0 so that would be 5, then we jump from 0 to 7 which would be 7. We then add the two numbers together, so 5 + 7 is 12. Therefore, the difference between 5 and +7 is 12.
Answer time
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What is the difference between 4 and 6?
1) 102) 23) 24) 24 
When using a numberline to find the difference between a positive and negative number, where is likely to be the best number to 'jump' to first?
1) 02) 13) 24) 1 
What is the difference between 7 and 9?
1) 162) 23) 24) 63 
What is the difference between 4 and 2?
1) 62) 23) 24) 6 
What is the difference between 7 and 2?
1) 92) 53) 114) 14 
What is the difference between 10 and 1?
1) 112) 93) 114) 10 
What method might be useful when finding the difference between a positive and negative number?
1) A numberline2) Grid method3) Chunking4) You shouldn't use a method. 
When using a numberline to find the difference between a positive and negative number, what should we do first?
1) Draw the numberline and write both numbers on it.2) Jump to any number on the numberline.3) Add the jumps together.4) Subtract the jumps. 
We can find the difference between a positive and negative number by...
1) counting between them.2) multiplying them.3) dividing them.4) turning the numbers into a fraction. 
Which side of 0, are negative numbers on the numberline?
1) To the left2) To the right3) On the left or the right.4) Negative numbers can't be on a numberline.
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