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Two Number Lines

Stage: 2 Challenge Level: Challenge Level:1

Two Number Lines

You could try Number Lines before this problem.

Max and Mandy both had number lines. Max's number line went along from left to right like this:

0-10 horizontal number line

Mandy's number line went up and down like this:

0-10 vertical number line

Max and Mandy both started at zero on their number lines. Max made a secret jump along his number line and then moved on seven and landed on $10$. How long was his secret jump?

Mandy made a jump of three and another secret jump. She landed on $6$. How long was her secret jump?

Max and Mandy decided to put their number lines together. Their teacher gave them some squared paper. They had made a graph. It looked like a bit like this:

graph with axes 0-10

Max moved four along and Mandy moved six up. They put a counter on the place they landed. Now their graph looked like this:

graph with point (4, 6) marked

How far had each of them moved along and up from $0$ to get the counter to the place marked on the grid below?

graph with point (9, 3) marked

If Max and Mandy both moved the same distance along and up, where could the counter be?

Why do this problem?

This problem follows on from Number Lines and could be used to introduce coordinates. In addition to focusing on ideas associated with inverse operations and algebra, the final part of this activity asks pupils to find all possibilities, giving them an opportunity to identify and explain the pattern produced on the graph.

Possible approach

It would be good for learners to work on this task practically, with number lines, squared paper and counters. These sheets of number lines could be printed off and cut out for this purpose.

Key questions

How far up Mandy's number line has the counter been put?
How far along Max's number line has the counter been put?
Where are you going to put your counter now?
If they both moved the same distance along or up their number line, can you think of a number of jumps they could have made?
What about a different number of jumps?
Can you think of a word to describe that line?

Possible extension

Learners could follow on with Fred the Class Robot.

Possible support

Suggest doing Number Lines instead.