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Leah and Tom both have number lines and a counter. They always start with their counters at zero.

Leah's number line goes along from left to right like this:

0-10 number line


First Leah made a jump of three along her number line and then a jump of four. Where did she land?

Next Leah made a secret jump along her number line. Then she made a jump of five and landed on $9$.


0-10 number line with 9 marked


How long was her secret jump?

Then Leah made a jump of six and another secret jump. She landed on $10$.

0-10 number line with 10 marked


How long was her second secret jump?

Tom's number line goes up and down like this:

0-10 vertical number line


First Tom made a jump of three up his number line and then a jump of two. Where did he land?

Next Tom made a secret jump up his number line. Then he made a jump of six and landed on $8$.

0-10 vertical number line with 8 marked


How long was his secret jump?

Then Tom made a jump of four and another secret jump. He landed on $7$.

0-10 vertical number line with 7 marked


How long was his second secret jump?

Printable NRICH Roadshow resources: Instructions and Number Line.