Solve number and practical problems that involve calculating intervals across zero

Introduced in the Year 6 curriculum as: "Solve number and practical problems that involve all of the above."

When calculating across 0, it is often best to split the calculation into two parts and calculate to 0 with the first part.


Example 1:

What is the difference between -5.4 and 3.8?

Both of these values are shown on this numberline. From -5.4 to 0 it is 5.4; from 0 to 3.8 is 3.8. So the total is 5.4 + 3.8 = 9.2.


Example 2:

What is -4.4 + 10?

Look at the numberline. We add 10 in two parts - first we add 4.4 to get to 0, then we add the remaining 5.6 to get to 5.6.


Example 3:

What is 5.6 - 12?

Look at the numberline. We subtract 12 in two parts - first we subtract 5.6 to get to 0, then we subtract the remaining 6.4 to get -6.4.


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