Using materials

Have a pile of tens frames with five or fewer dots on each.
Flash a tens frame briefly.
The students say aloud how many dots they see and model that pattern on one hand.

Once you are sure the students successfully know all their patterns to five, explore the numbers between six and ten.
Use a pile of tens frames with five or more dots on each.
Show one of the students a tens frame briefly.
That player says how many empty spaces there are on the frame.
If correct, the player moves their counter forwards that number of spaces on the playing board.
Alternate turns.
The first person to reach the end of their playing board is the winner. 

Dominoes are also excellent for getting students to learn to instantly recognise patterns for the numbers 0–6 (standard set) and 0–9 (extended set).
By playing the game, students learn to match without counting. 

Dice are similarly useful for the numbers 1–6.