Unit 9 Mathematics
Exercise 1: Listen to numbers and write
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 this
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 (+) to
show 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
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 it
together a number of timesExample
5 multiplied by 4 = 5 + 5 + 5 + 5 = 20
We took the number 5 and added it
together 4 times. This is why
multiplication 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
2. Write these calculations in words.
a. 3 × 3 = 9
b. 2 × 7 = 149.5 Talk about division
Division is breaking up or
dividing a number into an
equal number of parts.Example
20 divided by 4 = ?
If you take 20 bananas and put them into
four equal-sized groups, there will be 5
bananas 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
24 divided by 6 = ____.
Each boy will get ____
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 = 3Exercise 8: Match the words and numbers
Match the sentences in column 1 with the
calculations in column 2.
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
3. Count backwards from 20
to 1. Write the numbers in
your exercise book.
4. Match the calculations
with the correct numbers
5. Do the following calculations in groups.a. 19 – 4 =
b. 30 ÷ 5 =
c. 21 + 3 =
d. 6 x 5 =