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Maths SMART Textbook 1A Chapter 1

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Chapter

1

Numbers from

0 to 20

One, two, three, four, five.

Once I caught a fish alive.

Six, seven, eight, nine, ten.

Then I let it go again!

Do you know of any other number

rhymes? What number can you

count up to?

Learning Outcomes

• Count, read and write numbers

to 20

• Say numbers in order — forward

from 1 to 100; backward from

20 to 0

• Know the value of a digit in a

two-digit number

• Use the ‘=’ sign


Numbers to 10

Let us count from

1 to 10.

1 one

2 two

3 three

4 four

5 five

We can write a number as a numeral or as a word.

5 five

numeral

word

2

Maths SMART Grade 1


6 six

1

Chapter

7 seven

8 eight

9 nine

10 ten

Numbers from 0 to 20

3


How many legs do

these animals have?

1

5

2

6

3

4

spider

8

7

snake

The spider has 8 (eight) legs.

The snake has no legs. We say that it has 0 legs.

We can write 0 in words as zero.

Try This!

Count the pictures. How many are there?

Write the number in numerals and in words.

and

4

Maths SMART Grade 1


Hands-On

Maths

Matching pairs

Get into pairs.

Materials needed

(per pair):

• cards with numbers

1 to 10 in numerals

• cards with numbers

1 to 10 in words

1

Chapter

1 Mix up one set of cards and place them face down in a row. Do the

same for the other set of cards. Put them in a different row.

2 One player picks a card from each row. Keep both cards if they are

a matching pair. Return the cards to the rows if they are not a

matching pair.

3 Take turns to pick the cards. Repeat step 2.

The player with more cards at the end of the game wins.

Numbers from 0 to 20

5


On Your

Own

1 Count. How many are there?

(a)

(b)

2 Write these numbers in numerals.

(a) five (b) seven (c) ten

3 Write these numbers in words.

(a) 3 (b) 8 (c) 0

4 How many children are wearing glasses?

Write the number in numerals.

Workbook

1A

Go to Worksheet 1

6

Maths SMART Grade 1


Numbers to 20

1

Chapter

How many are there?

First, we make 10. Then we count on.

1 2 3 4 5

11 eleven

6 7 8 9 10

10

We can write 11 in words as eleven.

Look at the following. Can you count these?

11 12 twelve

10

Fascinating Fact!

Another word for the number 12 is a

dozen. The word dozen comes from an

old French word that means a group of 12.

Numbers from 0 to 20 7


11 12 13 thirteen

10

11 12 13 14 fourteen

10

11 12 13 14 15 fifteen

10

11 12 13 14 15

10

16 sixteen

8

Maths SMART Grade 1


1

Chapter

11 12 13 14 15

10

16 17 seventeen

11 12 13 14 15

10

16 17 18 eighteen

11 12 13 14 15

10

16 17 18 19 nineteen

11 12 13 14 15

10

16 17 18 19 20 twenty

Numbers from 0 to 20

9


How many cubes (

) are there?

First, I make 10.

10 and 5 make 15.

10

There are 15 (fifteen) cubes.

Try This!

How many books are there?

Write in numerals and in words.

10

and

10

Maths SMART Grade 1


Hands-On

Maths

Forward and backward

1

Chapter

Get into pairs.

Part of a number grid showing the numbers 1 to 100 has been torn away.

Look at the grid and read the numbers 1 to 20 out loud.

1, 2, 3, …

Now continue counting on to 100 by following the steps below.

1 Start by counting from 21 to 30.

2 Then get your friend to continue and count the next ten numbers.

3 Take turns to continue counting on ten numbers at a time.

Are you able to count up to 100? If not, what numbers can both of you

count up to?

Now, try counting back from 20 to 0. You may use the number grid shown

to help you.

Numbers from 0 to 20

11


On Your

Own

1 How many are there?

(a)

(b)

10

(c)

2 Write these numbers in numerals.

(a) twelve (b) eighteen (c) twenty

3 Write these numbers in words.

(a) 13 (b) 15

(c) 17 (d) 19

12

Maths SMART Grade 1


4 Fill in the boxes.

(a) 10 and 3 make . (b) 10 and 4 make .

1

Chapter

(c) 10 and 7 make . (d) 10 and make 20.

5 Look at the picture shown. Count the animals and write

the correct numbers in the boxes below.

Workbook

1A

Go to Worksheet 2

Numbers from 0 to 20 13


Place value — Tens and ones

Ari wants to count the number of cubes he has.

He uses a place value table to help him count.

Tens

Ones

10

1 6

10 ones make 1 ten.

1 ten 6 ones is equal to 16.

We can write ‘is equal to’ as ‘=’.

So, 1 ten 6 ones = 16.

14

Maths SMART Grade 1


(1) 10 ones make 1 ten.

1

Chapter

10

(2) Numbers with tens and ones are called two-digit numbers.

In a two-digit number, the first digit tells us the number of

tens and the second digit tells us the number of ones.

THINK!

Try This!

Fill in the boxes below.

How many tens and

ones are there in the

number 9?

Tens

Ones

ten ones =

Numbers from 0 to 20

15


On Your

Own

1 Write the missing numbers.

(a) Tens Ones (b) Tens Ones

2 Fill in the boxes.

ten ones = ten ones =

(a) 12 = 1 ten ones (b) 17 = ten 7 ones

(c) = 1 ten 9 ones (d) = 2 tens 0 ones

3 Which of these show the number 13? Tick (3) the correct

boxes.

1 ten 3 ones

3 ones

13 ones

Workbook

1A

Go to Worksheet 3

16

Maths SMART Grade 1


1

I Know That...

• I can write a number as a numeral or as a word. (page 2)

Example: 5 five

numeral

word

• When there are more than 10 things, I first make 10.

Then I count on from 10. (page 7)

Example:

Chapter

First, make 10.

10 and 5 make 15.

10

• 10 ones make 1 ten. (page 14)

10

Numbers from 0 to 20

17


• I can also use a place value table to help me count.

(page 14)

Tens

Ones

1 2 1 ten 2 ones = 12

• Numbers with tens and ones are called two-digit

numbers. In a two-digit number, the first digit tells us the

number of tens and the second digit tells us the number

of ones. (page 15)

Example: 13

tens

ones

Workbook

1A

Go to Putting It Together 1

Know these words

Read these words aloud and check if

you know what they mean.

• Numeral • Place value

• Count on • Ones

• Tens

• Equal

• Digit

18

Maths SMART Grade 1


21 st

Century Skills

Apply What You Know

1

Chapter

Creativity

1. Look at this alien. How many of the parts below does it have?

(a) ears

(b) eyes

(c) legs

(d) horns

In the space below, use your imagination to draw an alien

that has 4 ears, 5 eyes, 7 legs and 9 horns.

Numbers from 0 to 20 19


Communication

2. A shop sells pens in packets of ten or separately.

Dan needs to buy exactly 17 pens.

How many packets of pens should he buy?

How many extra pens should he buy?

What is a quick way of working out the answer without

counting?

Critical Thinking

& Problem-Solving

3. Farmer Jones has some chickens and ducks.

Each of these animals has 2 legs.

There are 20 legs altogether.

He has 4 ducks.

How many chickens does Farmer Jones have?

Hint: Draw pictures to help you.

Workbook

1A

Go to Putting It Together 2

20

Maths SMART Grade 1

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