Begin by explaining what decimal numbers are and what a decimal point is. Introduce them to the concept of place value and talk about each of the positions shown in the diagram.

Ask the students to individually write down a decimal number from 0.1 to 0.9 in their notebooks. Help the students, who do not understand the concept, by explaining what the decimal point signifies.

Once the students have written down their decimal numbers, form groups of four pairs to practice writing and ordering decimal numbers. Give each group a sheet of paper and have them work on it together.

Have the students play a game to identify the lesser and greater of two decimal numbers. Provide the students with a list of decimal numbers and ask them to rank them in order from smallest to the largest.

Finally, give each group a jumbled up set of decimal numbers and ask them to arrange them in the right order.

Provide feedback and reward the groups who did well with a small prize. Ask some of the students to explain their understanding of decimal numbers and how they solved the problem.