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## PS RU P1L11 Add _ Subtract within 20 WS

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# PS RU P1L11 Add _ Subtract within 20 WS

### PS RU P1L11 Add _ Subtract within 20 WS

PRIMARY 1

Rev Up! Math

Name

Tutor

Topic Addition and Subtraction Within 20 (Lesson 11)

Addition and Subtraction Within 20 (Lesson 11)

Primary 1: Rev Up! Math

10 11 12 13 14 15 16 17 18 19 20

Add by making 10 first Ring a set
of 10 first,
8 + 9 = 10 + then add.
=
We can also
use number
bonds to make

10 first.

8+9=

9 10 11 12 13 14 15 16 17 18 19 20

Subtract from 10 first 1

14 - 9 =

4 10 10 – 9 =
+4 = 5

So, 14 – 9 =

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Primary 1: Rev Up! Math

Exercise 1: Add or subtract using the counting on or counting back
method.

count the number of food items
we have collected each day for
this week. Youcan use the

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

a) 8 + 7 = b) 9 + 9 =
c) 20 - 6 = d) 17 - 9 =

e) 5 more than what we
have collected on Thursday.

f) 7 less than what we have Sunday is our rest and play
collected on Tuesday. day! We work hard and play

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Exercise 2: Add by making 10 first. Primary 1: Rev Up! Math
1) Ring a set of 10, then add.
Children, I have
(a) learnt my lesson

8 + 7 = 10 + and am now
= collecting food items

(b) to prepare for
winter. But I can’t

6+9= +
=

2) 5 + 7 =

.

6) 8 + 9 = 3

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Exercise 3: Subtract from 10 first. Primary 1: Rev Up! Math
1) 15 – 6 =
Do not put off what you can
do today till tomorrow.

2) Subtract 8 from 17. The answer is .

3) 17 - 9 =

4) Subtract 8 from 16. The answer is .

5) 13 - 5 =

6) 14 - =8

7) 18 - 9 =

8) 17 - =9 4

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Primary 1: Rev Up! Math

Exercise 4:
1. Fill in the missing numbers in shapes with an ant in the puzzle below.

7+ = 16

+ _ =+

_=

= += = =

17 + 3 = 20

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Primary 1: Rev Up! Math
2. Arrange the answers below from the smallest to the greatest.

8+5= 15 – 7 = 13 + 7 = 20 – 5 =

,,,
smallest

3 Fill in the boxes with 14, 13, 7 or 5. You may use the numbers more
than once.

+ = 20

- =6

4. + = 17 Value:
If = 9, Hard work pays off!
=

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Primary 1: Rev Up! Math

*Exercise 5: Fill in the blanks with numbers 1 to 9 so that the
numbers will add up to 15 diagonally, horizontally and
vertically. Use each number only once.

1. 1 ( ) 6 + 1 + ? = 15
6

() () 3 ? + ? + 3 = 15

2 () ( ) 2 + ? + ? = 15

6 + ? + 2 = 15 1 + ? + ? = 15 ? + 3 + ? = 15 Hints

2. 3 ()
4

( )( ) 1

2 ( )( )

Value:
Doing it right!
There is a right time for work
and a right time for play.

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