Positive and negative numbers

In this swimming pool, the steps go below the water. How could you number the steps below the water?

Can you add or subtract the two numbers on the spinners to complete a row of three?

In this game, you can add, subtract, multiply or divide the numbers on the dice. Which will you choose?

What numbers would you put on this number line as it goes under the sea level?

What can you discover about adding and subtracting sets of consecutive numbers?

Some of the numbers have fallen off Becky's number line. Can you figure out what they were?

Imagine a very strange bank account where you are only allowed to do two things...

Different combinations of the weights available allow you to make different totals. Which totals can you make?

Do you notice anything about the solutions when you add and/or subtract consecutive negative numbers?