FRACTIONS A4

TRY THIS ........

5/7 - 1/7 =

PERIMETER OF RECTANGLE B1

Find the value of c in the figure below if the perimeter is 52m.

Solution

Length = c+6 and width = c-2 and Perimeter = 52m.

Perimeter = 2(length + width)

Perimeter = 2[(c+6) + (c-2)]

Perimeter = 2[c+6 + c-2]

Perimeter = 2[c+ c + 6 -2]

Perimeter = 2[2c + 4]

But perimeter is 52m.

52 = 4c + 8

52 – 8 = 4c

44 = 4c

44 = 4c

 4      4

11 = c

Hence c is 11m

INTEGERS A4

Evaluate -100 – 100.

Solution

I have borrowed 100sh on Monday. Again I borrow 100sh on Tuesday. The total money I am required to pay will be a total of 100 and 100. Because it is a debt, the sign will remain to be negative.

Hence -100 – 100= -200

TRY THIS…………..

Evaluate -200 – 300.

ALGEBRA B46

Simplify x + x - y.

Solution

= x + x - y    [remember x + x = 2x]

= 2x - y

TRY THIS…………..

Simplify v + v – w

FRACTIONS A3

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

7/8 - 3/8 =

INTEGERS A3

Evaluate 10 – 40.

Solution

Imagine I have a debt of 40sh. If I pay 10sh, the debt won’t go off. It will decrease from -40 to -30.

Hence 10 – 40= -30

TRY THIS…………..

Evaluate 30 – 50.

ALGEBRA B45

Evaluate 6v – 8w if v = 7 and w = 4.

Solution

= 6v – 8w

= (6 x v) – (8 x w)

= (6 x 7) – (8 x 4)

= 42 - 32

= 10

∴ 6v – 8w = 10 answer

TRY THIS……………

Evaluate 9v – 8w if v = 5 and w = 3.