In this lesson, students play a Dominoes game. Children who have never played dominoes should be introduced to the game. Begin in a whole-group setting by showing the students a set of Double 6 dominoes.

Encourage the students to describe what they notice as they look at the tiles.

From a set of dominoes, select those that have 5, 6, 7, or 8 total spots. Place them upside down in an array where the children can see them. Now call on one student at a time to turn over two dominoes.

When the student turns over dominoes with the same **total** number of spots (sum), the student keeps them.

If the dominoes have different sums, both dominoes are returned face down to their place in the array and another child is called on.

You may want to play this game twice and then suggest that children can play it in pairs at a later time.

Now display the Using Calculators and Hundred Boards Electronic Tool.

Hundreds Chart Interactive

Alternatively, you may give the children calculators and Hundreds Charts.

Hundreds Chart

Explain to students that they are to use the calculator to find the addend pairs that give a sum of 5, then to ring each sum in yellow on the hundreds chart. When the students have finished, ask them to ring sums of 6 in green, sums of 7 in black, and sums of 8 in brown. At an appropriate time, call the children together and ask them to describe any patterns that they notice on the hundreds board.

Now give the students individual Addition Charts and ask them to complete the cells for any facts that they know by heart.

Addition Chart

This activity will help them focus on the addition facts they know and those they have yet to memorize.

When the students are ready, remind them of the order property and ask them what else they can cover if they know, for instance, 4 + 3. If they answer 3 + 4, tell them to cover that also. When they have finished, ask if they know something about adding 0. If they can tell you the sum is always the same as the other addend, have them complete all the sums in the first row and column. Encourage them to notice that only a few facts remain blank. Remind them that they need to practice these facts.