PS RU P1L18 Numbers to 40 [2] WS

PRIMARY 1

Rev Up! Math

Name Numbers to 40 [2] (Lesson 18)
Tutor
Topic

Numbers to 40 [2] (Lesson 18)

Primary 1: Rev Up! Math

Addition within 40 Working

Exercise 1: Solve the following word problems.

1) Jack climbed 15 steps. He climbed 7 more steps.
How many steps did he climb altogether?

=

He climbed steps altogether.

2) Jack ate 15 beans and had 18 beans left. Working
How many beans did he have at first?

=

He had beans at first.

3) Jack ate 14 beans. His mother ate 5 more than him.
How many beans did his mother eat?

Working

=

His mother ate beans. 1

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Primary 1: Rev Up! Math

*4) Jack ate 12 beans. His mother ate 7 more than him.
a) How many beans did his mother eat?

Jack 12 Altogether
Mother 7 more (b) ?

(a) ?

His mother ate (more / fewer) beans than Jack.

Working
=

Jack’s mother ate beans.

b) How many beans did they eat altogether?
=

They ate beans altogether.

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Primary 1: Rev Up! Math

Subtraction within 40

Exercise 2: Subtract

The giant wanted me to collect golden
eggs for him. He promised that I could
keep whatever that‘s left. How many
golden eggs could I bring home?

I collected 40 eggs. I collected another 30
The giant ate 10 eggs eggs. The giant ate 6
for breakfast. eggs for his tea break.

1) 40 - 10 = 2) - 6 =

I gave the giant 26 eggs. He
ate 8 eggs for lunch.

3) - 8 =

*4) I collected 20 eggs. The giant ate
7 eggs and I ate 5 eggs for dinner.
How many eggs were left?

20 - =

-5 =

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Exercise 3: Primary 1: Rev Up! Math
1)
However, the giant still would not let me
go! He wanted me to complete all the
subtraction questions below. I would earn
one golden egg for every correct answer.
Please help me, children.

(a) (d)

Tens Ones (b) (c) 31
28 - 18
Tens Ones 24
-5 39 - 17

- 17

(e) *(f) You have collected
Subtract 27 Subtract 15 golden

from 32. from eggs.
3 tens 3 ones.
-
-

Subtract means “take away”. 4

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Primary 1: Rev Up! Math

Exercise 4:

The giant decided to give Jack a task
to complete each day for a week.
He promised to allow Jack to return to
his mother if Jack could complete all
the tasks.

a) 19 – 12 = b) 38 – 21 = c) 24 – 9 =

19 38 24
- 12 - 21 -9

d) 33 – 15 = *f) 31 – 13 =

e) 34 – 17 =
--

- 5

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Primary 1: Rev Up! Math

9 + ? = 34
=

3 6

-4

28

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Primary 1: Rev Up! Math

Exercise 5: Solve the following word problems.

1) Joshua has 20 stamps.
Peter has 12 fewer stamps than Joshua.
How many stamps does Peter have?
()
Joshua

() ()

()

=

Peter has stamps.

2) 18 children are in the Art club.
9 of them are boys.

How many girls are in the Art club?
()

( ) boys ( ) girls
=

girls are in the Art club. 7

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Primary 1: Rev Up! Math

*3) Jack baked 17 pies. His mother baked 4 fewer pies than Jack.
a) How many pies did his mother bake?

She baked pies.

b) How many pies did they bake altogether?

They baked pies altogether.

*4) The giant had 19 eggs at first.
8 of them were rotten and he gave 5 to Jack.
How many eggs did the giant have in the end?

He had eggs in the end.

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Primary 1: Rev Up! Math

Exercise 6:

17
7

20

Record the
number equations:

*1) 20 – =9

*2) 16 – =9

*3) – = 9

*4) – = 9

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Primary 1: Rev Up! Math

Extension

Exercise 7:

The digits 6 to 14 are placed inside the tic-tac-toe as shown.
Study the given examples and complete the rest of the sums.
Example:

6+ 7 = 13

6 78

1. 6 + 9 = 9 10 11
12 13 14

2. 8 + 11 =

3. 9 + =

4. + 13 =

5. 6 + =

6. + =

7. + = 10

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