Here is the receipt. The total is €12.50. Look at the price printed for the juice: €7.5. Is that written correctly for money? What is missing?

Watch three money ideas build in the coin tray, one at a time.

A zero that holds a place. In €7.50, the zero in the one-cent column keeps the 5 in the ten-cent place. Read it aloud.

Adding money. Here are the two amounts we will add: €12.50 and €8.75.

Now the total, €21.25. Watch what happens when a cent column goes past nine and we carry into the next column.

Sharing money. We split €27.60 equally among three, sharing the euros first, then the cent, to reach €9.20 each.

Today we build and combine money on the tray, one task at a time. Say each cent column aloud before we check it.

• First, build €3.05. Watch the zero holding the ten-cent column.
• Next, build €3.25, then work out four lots of it altogether.
• Last, build €20.00 and count up from €13.45 to find the change.

Now we solve real shopping problems together at the board. There are three core problems, each one a step further. First we total a small shopping list. Then we find change from a note. Then we split a bill fairly among three. If time allows, the strongest pupils reach an extension: work out the change from €20 after buying three items at €4.95 each.