8/8/2019 2 Mixed Operation (Pg 35-40)

1/6

WAJA MATHS YEAR 4 JPN PERAK

35

Learning Outcomes

1. Perform mixed operations involving addition and

subtraction with numbers less than

100

1 000

10 000

2. Solve mixed operation problems

2. Solve mixed operation problems

8/8/2019 2 Mixed Operation (Pg 35-40)

2/6

WAJA MATHS YEAR 4 JPN PERAK

1 Perform mixed operations involving addition and subtraction with numbers less thana) 100 b) 1 000 c) 10 000

Example 1.

36

*TIPS

* + and are in one group.

* x and are in one group.

Points to note.

* Opposite addition is subtraction.* Opposite subtraction is addition.* So they are in one group.* Solve the first operation.* Why? The group should co-

operate.

78 + 15 48 =

48 + 69 92 =

1 0 11

4 8 1 1 7

+ 6 9 9 2

1 1 7 2 5

Lets try this

Solve the first operation in

vertical form.

8/8/2019 2 Mixed Operation (Pg 35-40)

3/6

WAJA MATHS YEAR 4 JPN PERAK

Example 2.

37

96 45 + 29 =

Solve the first operation

in vertical form.

85 - 49 + 73 =

7 15

8 5 3 6 4 9 + 7 3

3 6 1 0 9

Lets

try

this

.

8/8/2019 2 Mixed Operation (Pg 35-40)

4/6

WAJA MATHS YEAR 4 JPN PERAK

Exercise 1

Solve the following in vertical form.

1 39 + 44 27 = 2 68 12 + 36 =

3 452 + 192 282 = 4 989 731 + 462 =

5 2 835 + 4 340 2 101 = 6 912 467 + 765 =

38

8/8/2019 2 Mixed Operation (Pg 35-40)

5/6

WAJA MATHS YEAR 4 JPN PERAK

2. Solve mixed operation problems

Example 1.

Encik Leman had 6 453 eggs. After selling 2 072 eggs, he bought another 2 785 eggs.

How many eggs does Encik Leman have altogether?

Step 1.Read and understand question. As you read underline the keywords.

Encik Leman had 6 453 eggs. Afterselling 2 072 eggs, he bought another

2 785 eggs. How many eggs does Encik Leman have altogether?

Step 2.

Write the operation / formula the keywords signify

( - ) ( + )

Encik Leman had 6 453 eggs. Afterselling 2 072 eggs, he bought another

2 785 eggs. How many eggs does Encik Leman have altogether?

Step 3. (Solve the problem)

6 453 2 072 + 2 785

6 453 4 381

2 072 + 2 785

4 381 7 166

Answer : 7 166 eggs

39

Points to note.

Keywords

Plus

Total

Sum of addition

Altogether ( + )

More than

Minus

Remainder

Subtract subtraction

Take away ( )

Left

Less than

Balance

8/8/2019 2 Mixed Operation (Pg 35-40)

6/6

WAJA MATHS YEAR 4 JPN PERAK

Exercise 2

Solve the problems.

1. There are 58 ducks in Abus farm. He bought 86 more ducks. He sold 74

ducks the next day. How many ducks are in the farm now?

.

2. A builder had 523 bricks. He used 459 bricks and bought another 718 bricks.

How many bricks did he have altogether?

3. There were 3 655 white beads and 4 678 brown beads in a box. Miss Lee

took 1 433 beads out of the box. Calculate the number of beads left.

40