This is a simple card game that helps with understanding '7'
You need a pack of playing cards or a set of 1-6 number cards
Take the pack of playing cards and remove all the cards above 6, including the court cards.
You will be left with A to 6 of each suit.

Mix this packet of 24 cards.
With the pack face-down on the table.
The players take it in turns to turn over the top two cards.
If the two cards total 7, the player chooses one to keep.

The other card is turned face-down and slid beneath the rest of the pack.
If the two cards do not total 7...

Both cards are turned face-down and slid beneath the rest of the pack.
The game continues in this way until one player manages to collect 7 cards.
This player is the winner.
Encourage the winner to count his or her cards to make certain they have seven.
They should count them individually, then separate them into face-down piles of cards so they can form different combinations of numbers which total seven.
Help them to talk about their cards until they are confident saying things like:
“Here are 3 cards, and here are 4 cards. Altogether I have seven cards.”
"I have 5 cards and 2 cards - that makes 7 cards in total."