1
Taking some away
Learner’s Book 1: Unit 5, p. 78
GoalTake some away from a group by crossing out, and say how many are left.
New words
subtract · take some awaytake away · remove some from a groupleft · what is still there after some are taken away
Explanation
When some things are eaten, given away or go away, we want to know how many are left. Finding out is called subtracting. ‘Subtract’ and ‘take away’ mean the same thing. To take away, cross out some objects. Then count the objects that are not crossed out. There are 6 cherries. Take away 2, and 4 are left. We say: 6 take away 2 equals 4. With signs we write 6 − 2 = 4. The sign − means take away.
Worked examples
Sara has 8 stickers. She gives 3 away. Cross out 3. Count the rest: 5 are left. 8 − 3 = 5.
There are 5 counters. Take away 1. 4 are left. 5 − 1 = 4.
On a number line, taking away means jumping back. Start at 7 and jump back 2. You land on 5. 7 − 2 = 5.
Class activity
Snack take-away: put 8 raisins, beans or buttons on a plate. Take away 3 and put them aside. Count what is left. Say the whole sentence: ‘8 take away 3 equals 5’. Then try again with different numbers up to 10.
Practice
1
How many birds are left?
5 (7 − 2 = 5)
2
How many apples are left?
3 (6 − 3 = 3)
3
There are 10 grapes. Ali eats 4. How many are left?
6
4
Write with signs: 8 take away 2 equals 6.
8 − 2 = 6