### Unit :9 Mathematics

**Unit 9 Mathematics****Exercise 1: Listen to numbers and write**

them down

1. Take turns to say the numbers from one

to ten out loud.

2. Write the numbers out as words.

3. Complete the sentences.

a. Five comes after ___ and before ___.

b. Three comes after ___.

c. The number before eight is ___.**Exercise 2: Names of numbers**

Say the names of all the numbers in thisnumber square.

**Learning box**

When we add ten hundreds together we

get one thousand.

Ten hundreds equal one thousand.We write a thousand as 1,000.

**9.2 Talk about addition**

When we do addition, we

add two or more numbers

together to make a total.

We use the plus sign (+) toshow that we are adding.

**Exercise 4: Practise addition**

1. Write the calculations in words.

a. 4 + 7 = 11 b. 3 + 5 = 8

2. Write the words below in the correct

order to make a calculation.

nine, four, equals, plus, five

3. Complete the sentences.

In our class there are ____ boys and____ girls. ____ plus ____ equals ____.

**9.3 Talk about subtraction**

When we do subtraction, we take one amount

away from another amount. It is the opposite

of addition. We use the minus sign (–) to show

that we are taking something away.**Exercise 5: Practise subtraction**

1. There are eight bananas. The monkey

eats five. How many bananas are left?

Write it like this: Eight minus five

equals ____.

2. Write the calculations in words.

a. 7 – 4 = 3 b. 20 – 8 = 12

3. Write the calculations in numbers.

a. Ten minus two equals eight.b. Eleven minus five equals six.

**9.4 Talk about multiplication**

When we multiply, we take

one number and add ittogether a number of times

**Example**

5 multiplied by 4 = 5 + 5 + 5 + 5 = 20

We took the number 5 and added it

together 4 times. This is whymultiplication is sometimes called “times”.

**Exercise 6: Practise multiplication**

1. A girl has three bags

of apples, with six

apples in each bag.

a. How many apples

does she have?

b. Write the

calculation in

numbers.

2. Write these calculations in words.

a. 3 × 3 = 9b. 2 × 7 = 14

**9.5 Talk about division**

Division is breaking up or

dividing a number into anequal number of parts.

**Example**

20 divided by 4 = ?

If you take 20 bananas and put them into

four equal-sized groups, there will be 5bananas in each group. The answer is 5.

**Exercise 7: Practise division**

1. In this bag there are 24 sweets. There

are 6 boys who want to

share them.

24 divided by 6 = ____.

Each boy will get ____

sweets.

2. What is ten divided by five? Write the

calculation in numbers.

3. Write the calculations in words.a. 10 ÷ 2 = 5 b. 12 ÷ 4 = 3

**Exercise 8: Match the words and numbers**

Match the sentences in column 1 with thecalculations in column 2.

**9.6 Review**

1. Write the numbers as words.

a. 9 b. 3 c. 5

d. 11 e. 20 f. 100

2. Match the signs in the

table with the correct

word.

3. Count backwards from 20

to 1. Write the numbers in

your exercise book.

4. Match the calculations

with the correct numbersin words.

a. 19 – 4 =**5. Do the following calculations in groups.**

b. 30 ÷ 5 =

c. 21 + 3 =d. 6 x 5 =