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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 1
29/4/14 3:21 PM
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
Maths SMART Grade 1
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 2
29/4/14 3:21 PM
Chap
6
six
7
seven
8
eight
9
nine
10
ten
Numbers from 0 to 20
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 3
te r
1
3
29/4/14 3:21 PM
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
Maths SMART Grade 1
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 4
29/4/14 3:21 PM
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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 5
5
29/4/14 3:21 PM
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
Maths SMART Grade 1
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 6
29/4/14 3:21 PM
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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 7
7
29/4/14 3:21 PM
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
Maths SMART Grade 1
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 8
29/4/14 3:21 PM
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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 9
9
29/4/14 3:21 PM
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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 10
29/4/14 3:21 PM
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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 11
11
29/4/14 3:21 PM
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
Maths SMART Grade 1
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 12
29/4/14 3:21 PM
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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 13
13
29/4/14 3:21 PM
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
Maths SMART Grade 1
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 14
29/4/14 3:22 PM
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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 15
15
29/4/14 3:22 PM
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
1A
16
Go to Worksh
eet 3
Maths SMART Grade 1
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 16
29/4/14 3:22 PM
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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 17
17
29/4/14 3:22 PM
• 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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 18
29/4/14 3:22 PM
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
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 19
19
29/4/14 3:22 PM
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
20
Go to Putting
It Together
2
Maths SMART Grade 1
01 MathTB G1A C1 Numbers 0 to 20 1-20.indd 20
29/4/14 3:22 PM