2
Zero: none left
Joyful Mathematics: Chapter 4
GoalUnderstand that zero means none, and count backwards to 0.
New words
zero · none; not anyleft · still therecount back · say the numbers going down
Explanation
Harpreet has 3 sweets. She eats 1. Now she has 2. She eats 1 more. Now she has 1. She eats the last sweet. Now she has none. None is called zero. We write zero as 0. Zero is a number too. Count back: 3, 2, 1, 0.
Worked examples
3 apples. We eat all 3. 0 are left.
Count back from 5: 5, 4, 3, 2, 1, 0.
There are no cows in the picture. The number of cows is 0.
Class activity
Disappearing game. Put 5 buttons on a table. Take one away at a time. Say how many are left each time: 5, 4, 3, 2, 1, 0. Then count back from 9 to 0.
Practice
1
How many apples are in the bowl?
0. There are none.
2
You have 2 laddoos. You eat both. How many are left?
0.
3
Count back from 5 to 0. Say all the numbers.
5, 4, 3, 2, 1, 0.
4
4 mangoes are eaten. How many are left?
0.
5
How many elephants are in your pocket?
0.