PS RU P1L24 Subtraction within 100 WS

Primary 1: Rev Up! Math

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Topic: Subtraction within 100 (Lesson 24)

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Subtraction within 100 (Lesson 24)

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Primary 1: Rev Up! Math

Exercise 1: Subtract

1.

11 - 1 =

2.

15 - 3 =

3.

13 - 2 =

4.

16 - 3 =

5.

14 - 2 =

6.

18 - 4 =

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Exercise 2: Count back to subtract. Primary 1: Rev Up! Math

1. X XX
a.
45

45 - =

b. XX

-= 56

c.

XX X X

55

-= 2

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Primary 1: Rev Up! Math

d. X 45

45 - =

e. X X X

-= 56

X Xf. = 55
XX
3
-

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Primary 1: Rev Up! Math

2. b.
a.
32 _ 20 =
32 _ 10 =

3. b.
a.
54 _ 30 =
54 _ 20 =

4. b.
a.
78 _ 40 =
78 _ 30 =

5. b.
a.
61 _ 40 =
61 _ 30 =

6. b.
a.
59 _ 40 =
59 _ 30 =

7. b.
a.
88 _ 50 =
88 _ 40 =

8. b.
a.
100 _ 60 =
100 _ 50 =

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Exercise 3: Primary 1: Rev Up! Math

(a) (b)
Tens Ones Tens Ones

68 69
-5 - 47

(c) (d)
78 87
- 37 - 35

(e) (f)
Subtract 37 Subtract 35

from 69. from
9 tens 6 ones.
-
-

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Primary 1: Rev Up! Math

Exercise 4:

a) 52 – 9 = b) 74 – 15 = c) 64 – 26 =

52 74 64
-9 - 15 - 26

d) 63 – 25 = e) 54 – 37 = f) 91 – 73 =
- - -

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Primary 1: Rev Up! Math

Exercise 5:

(a) 31 + ? = 65
=

(b)

(d) 6 7

-4

58

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Primary 1: Rev Up! Math

Exercise 5: Solve the following word problems.

1) Winnie has 60 paper dolls.
Kate has 19 fewer paper dolls than Winnie.
How many paper dolls does Kate have?
()
()

() ()

()

=

Kate has paper dolls.

2) Mdm Faridah baked 51 cupcakes.
She had 27 cupcakes left after giving some cupcakes to her neighbours.
How many cupcakes did she give to her neighbours?

()

() ()
=

Mdm Faridah gave 8cupcakes to her neighbours.

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Primary 1: Rev Up! Math

3) Kenny has 84 toy soldiers.
His brother, Henry, has 27 fewer toy soldiers than him.
a) How many toy soldiers does Henry have?

Henry has toy soldiers.

b) How many toy soldiers do they have altogether?

They have toy soldiers altogether.

4) A giant had 73 eggs at first.
18 of them were rotten and he broke 9 eggs.
How many eggs did the giant have in the end?

He had eggs in the end. 9

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Primary 1: Rev Up! Math

5) Gina has 64 paperclips.
She has 29 paperclips more than May.
a) How many paperclips does May have?

May has paperclips.

b) How many paperclips do the two girls have altogether?

They have paperclips altogether.

6) Mrs Tan is 37 years old now.
3 years ago, her brother was 35 years old.
What is their total age now?

Their total age is years old. 10

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