Explain the rules of the game. Count the number of children who are playing the game out loud; if just one child is playing, let him "go first." Otherwise, tell the children that they will play from youngest to oldest, and let them determine the who goes first-- a math problem of its own.
Give each child a die to hold and ask him to find the different dots, numbers one through six. Tell kids that two dice are used to play the game of Snakes and Ladders, and on each roll the numbers are added together to see how many spaces are moved; therefore, the highest number someone can get on a roll is 12, and the lowest number someone can get is two.
Ask each child how many dots are on the face of his dice after each roll. Make extra effort to avoid prompting the child, and give him ample time to figure out the answer. Point to each dot and count aloud, if necessary, to help him learn the number of dots.
Move your playing piece slowly, counting the spaces aloud while moving it. Emphasize the difference between moving a playing piece forward on ladder spaces and moving a playing piece backward on snake spaces, counting out loud when moving backward as well. Use the opportunity of sliding "down" the snake to explain subtraction by demonstrating how to subtract where the game piece landed after sliding down the snake compared to where it started out when it landed on the snake's head.
Explain some rules of addition and subtraction as the game pieces are moved forward and backward, such as:
1. An odd number plus an odd number equals an even number
2. An odd number plus an even number equals an odd number
3. An even number plus an even number always equals an even number
and
1. An odd number minus an odd number equals an even number
2. An even number minus an odd number equals an odd number
3. An even number minus an even number is always an even number