BODMAS B2

Find the value of 30 – 60 ÷ 20 x 2

solution

Here we use BODMAS

1st we divide, then we multiply, lastly we subtract.

= 30 – 60 ÷ 20 x 2

=  30 – 3  x 2 (after dividing)

= 30 – 6 (after multiplication)

= 24    (then we get 24 after subtraction)

TRY THIS…………………………………

Find the value of 100 – 60 ÷ 10 x 8

AREAS A3

Area of rectangle is 550cm². Find length if width is 5cm.

Solution

Area = Length x width

550  = L  x  5

550 = 5L

¹¹⁰550 =    ¹5L

    ₁ 5          ₁5

L = 110cm

Hence length is 110cm

TRY THIS..............

Area of rectangle is 90cm². Find length if width is 5cm.

BODMAS B1

Find the value of 11 – 7 + 3 – 1 + 5 – 4

solution

Here we use BODMAS

There is only addition and subtraction, We add first before we subtract

= 11 – 7 + 3 – 1 + 5 – 4

= 11 + 3 + 5 – 7– 1– 4    (rearranging positives and negatives)

= 19 – 7– 1– 4    (dealing with positives first we get 19)

= 19 – 12    (then we add the negatives to get -12)

= 7    (then we get 7 after subtraction)

Hence 11 – 7 + 3 – 1 + 5 – 4 = 7

TRY THIS............

Find the value of 16 – 7 + 3 – 1 + 3 – 6

ALGEBRA B56

Simplify 10p + 6m + 2m + 7p

Solution

=10p + 6m + 2m + 7p

=10p + 7p  + 6m + 2m ( collecting the like terms)

= 17p + 8m ( adding the like terms)

Hence 10p + 5m + 2m + 7p = 17p + 8m

TRY THIS………………..

 Simplify 20p + 6m + 8m + 7p

PERIMETER OF A SQUARE B1

Find the perimeter of square below.

Solution

Perimeter = 4  x  side

               = 4 x 120

               = 480

Hence perimeter is 480.

DEGREES B1

Find the value of a in the following figure.

solution

3a + a + 72 + 108⁰ = 360⁰

4a + 180⁰ = 360⁰  [collecting like terms]

4a = 360⁰ - 180⁰

4a = 180⁰

4a = 180⁰       [dividing by 4 on both sides]

4        4

a = 45⁰

AGES B1

paul’s age is three times that of Agnes. If the total of their age is 64, Find the age of Paul.

Solution

Diana = y

Paulina = 3y

Diana	Paulina	Jumla
y	3y	64

y+3y = 64

4y = 64

4y = 64

4       4

y = 16

 Paulina's age = 3y

                            = 3x16

                            = 48

Palina is 48

TRY THIS............

Paula's age is four times that of Ana. If the total of their age is 50, Find the age of Paula.