• Unit :9 Mathematics

    Unit  9 Mathematics

    good

    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 this

    number square.

    good

    good

    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
    goodWhen 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
    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.

    good

    9.4 Talk about multiplication
    goodWhen we multiply, we take
    one number and add it

    together 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 why

    multiplication is sometimes called “times”.

    Exercise 6: Practise multiplication
    good1. 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 = 9

    b. 2 × 7 = 14

    9.5 Talk about division
    goodDivision 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
    share them.
    good24 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 the

    calculations in column 2.

    good

    9.6 Review
    1. Write the numbers as words.
    gooda. 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 numbers

    in words.

    good

    5. Do the following calculations in groups.

    a. 19 – 4 =
    b. 30 ÷ 5 =
    c. 21 + 3 =

    d. 6 x 5 =


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