There are **7** NRICH Mathematical resources connected to **Calculating with decimals**, you may find related items under Fractions, Decimals, Percentages, Ratio and Proportion.

Find the product of the numbers on the routes from A to B. Which route has the smallest product? Which the largest?

Where will the point stop after it has turned through 30 000 degrees? I took out my calculator and typed 30 000 ÷ 360. How did this help?

The items in the shopping basket add and multiply to give the same amount. What could their prices be?

Is it cheaper to cook a meal from scratch or to buy a ready meal? What difference does the number of people you're cooking for make?

What does the empirical formula of this mixture of iron oxides tell you about its consituents?

Find out why these matrices are magic. Can you work out how they were made? Can you make your own Magic Matrix?

Use the clocks to investigate French decimal time in this problem. Can you see how this time system worked?