Maths SMART Textbook 1A Chapter 1

Chap

1

te r

Numbers from 0 to 20

, five. r u o f , e e r h t One, two, ive.

Once I caught a fish al

, ten.

Six, seven, eight, nine Then I let it go again!

Learning Outcomes • Count, read and write numbers to 20

Do you know of any other number rhymes? What number can you count up to?

• 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

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Numbers to 10

Let us count from 1 to 10.

1

one

2

two

3

three

4

four

5

ďŹ ve

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

5 numeral

2

five word

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Chap

6

six

7

seven

8

eight

9

nine

10

ten

Numbers from 0 to 20

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3

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How many legs do these animals have?

1

5

2

6 3 4

8

7

spider

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

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Hands-On Maths Matching pairs Get into pairs.

Chap

Materials needed (per pair):

te r

1

cards with numbers 1 to 10 in numerals • cards with numbers 1 to 10 in words •

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

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On Your Own

1

Count. How many are there? (a)

(b)

2

Write these numbers in numerals. (a) five

3

(c) ten

Write these numbers in words. (a) 3

4

(b) seven

(b) 8

(c) 0

How many children are wearing glasses?

Write the number in numerals.

Workbook

1A

6

Go to Worksh

eet 1

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Chap

te r

1

Numbers to 20 How many are there?

First, we make 10. Then we count on.

1

3

2

4

5

11 6

8

7

9

eleven

10

10 We can write 11 in words as eleven.

Look at the following. Can you count these?

11

10

12

twelve

Ano Fasc th inating Fact! doze er wor d n old F . The w for the num renc ber 12 is a o h w rd dozen c omes from an ord that m eans a group of 12.

Numbers from 0 to 20

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11

12

11

12

13

thirteen

10

14

13

fourteen

10

11

12

13

14

15

ďŹ fteen

10

11

10 8

16

12

13

14

15

sixteen

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Chap

te r

1

10

10

10

10

11

12

13

14

15

16

17

11

12

13

16

17

18

11

12

13

14

15

16

17

18

19

nineteen

seventeen

14

15

eighteen

11

12

13

14

15

16

17

18

19 20

twenty

Numbers from 0 to 20

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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

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Chap

te r

1

Hands-On Maths Forward and backward 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

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On Your Own

1

How many are there? (a)

10 (b)

(c)

2

Write these numbers in numerals. (a) twelve

3

12

(b) eighteen

(c) twenty

Write these numbers in words. (a) 13

(b) 15

(c) 17

(d) 19

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Chap

4

5

te r

1

Fill in the boxes. (a) 10 and 3 make

. (b) 10 and 4 make

(c) 10 and 7 make

.

(d) 10 and

.

make 20.

Look at the picture shown. Count the animals and write the correct numbers in the boxes below.

Workbook

1A

Go to Worksh

eet 2

Numbers from 0 to 20

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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.

10

Tens

Ones

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

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Chap

te r

1

(1) 10 ones make 1 ten.

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!

How many tens and ones are there in the number 9?

Try This!

Fill in the boxes below.

Tens

Ones

ten

ones =

Numbers from 0 to 20

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On Your Own

1

Write the missing numbers. (a)

Tens

ten 2

Tens

ones =

Ones

ten

ones =

Fill in the boxes. (a) 12 = 1 ten (c)

3

(b)

Ones

ones

(b) 17 =

= 1 ten 9 ones

(d)

ten 7 ones = 2 tens 0 ones

Which of these show the number 13? Tick (✓) the correct boxes.

es

1 ten 3 on

3 ones

13 ones

Workbook

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Chap

te r

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:

First, make 10.

10 and 5 make 15.

10 • 10 ones make 1 ten. (page 14)

10

Numbers from 0 to 20

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• 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

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21

Chap

st

1

ry Skills ntu Ce

tiv rea ity C

te r

K n ow Apply What You

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

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Co m

nica t

n io

mu

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? g in

C &P r r

g

l Think i ica it lem-Sol n v ob

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

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It Together

2

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