Two ways to make it

Challenge 5 of 16

Both numbers are yours here, so there is more than one right answer — any pair that adds up to the target will do. Worth knowing in general: a sketch is graded on what comes out, not on how you got there.

Fill in two numbers that make the target.

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Fill in two numbers that make the target.

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Lesson Adding Numbers

Adding is written the way you would write it on paper: var x = 2 + 3; The sum is worked out first, and its answer — 5 — is what ends up in the box.

That is worth pausing on, because it means you never type the answer. You give the parts and the sketch does the arithmetic. Change one of the parts and the answer changes with it, without you touching anything else.

The parts do not have to be numbers you typed. They can be other boxes: var total = a + b; makes total hold whatever a and b add up to at the time. Set a to 3 and b to 5 and total is 8; change a to 10 and total is 15, on its own.

A sum can be as long as you like — var total = maths + science + art; adds all three.

Adding is forgiving about order: 3 + 5 and 5 + 3 both make 8, so a pair of numbers can go in either way round. That stops being true in the next topic.

In this topic you will fill in missing numbers to hit a total, keep several sums at once, and then add boxes together by name.