mathematics topic length year 3

SOLVING PROBLEM

INVOLVING LENGTH

2007 2008

150cm ?cm

10cm

Devi

In year 2007, Devi’s height was 150cm. This year, Devi’s height is 10cm more than last year. What is

the height of Devi now?

160cm

How did you get the answer?

150cm + 10cm = 160cm

160cm 155cm

Devi Ita

Devi’s height is 160cm. Ita’s height is 155cm. What is the difference between both heights?

5cm

How did you get the answer?

160cm - 155cm = 5cm

Iqlimah has a 112cm long red ribbon. Shahira has a 86cm long red ribbon too. What is the total length of ribbons they have?

What is given?The length of red the ribbons.

What is asked for?The total length of ribbons.

What operation is needed?Addition.

Iqlimah has a 112cm long red ribbon. Shahira has a 86cm long red ribbon too. What is the total length of ribbons they have?

112cm + 86cm =

112cm + 86cm

198cm

The curtain for the door is 15m long. The curtain for the window is 13m long? What is the total length of the two curtains?

What is given?The length of the door and window.

What is asked for?The total length of the two curtains.

What operation is needed?Addition.

The curtain for the door is 15m long. The curtain for the window is 13m long? What is the total length of the two curtains?

15m + 13m =

15m + 13m

28m

A rope is 118cm long. Anis uses 94cm of the rope to tie a box. What is the length of the rope left? What is given?Length of the rope: 118cmLength used : 94cm

What is asked for?The length of the rope left.

What operation is needed?Subtraction.

A rope is 118cm long. Anis uses 94cm of the rope to tie a box. What is the length of the rope left?

118cm – 94cm =

118cm - 94cm

24cm

What is the difference in height between Petronas Twin Towers and Menara Kuala Lumpur ?

What is the difference in height between Petronas Twin Towers and Menara Kuala Lumpur ?

What is given?Petronas Twin Towers : 452mMenara Kuala Lumpur : 412m

What is asked for?The difference in height between the two towers.

What operation is needed?Subtraction.

452m 412m

What is the difference in height between Petronas Twin Towers and Menara Kuala Lumpur ?

452m – 412m =

452m - 412m 40m

452m 412m

groupACTIVITIES

1. Building R is 48m tall. It is 6m taller than building S. Calculate the height, in m, of building S.

48m + 6m =

48m + 6m

54m

2. Brian has a rope measuring 800m. His brother also has a rope measuring 487m. What is the difference in length between their ropes?

800m - 487m =

800m - 487m

313m

3. Aziz is 95cm tall and Bakar is 83cm tall. What is their total height?

95cm + 83cm =

95cm + 83cm

178cm

4. My pencil is 18cm long. My brother’s pencil is 6cm long. What is the difference in length between the two pencils?

18cm - 6cm =

18cm - 6cm

12cm

1. River A is 750m long. River B is 182m longer than river A. What is the total length of the two rivers?

750m + 182m =

750m + 182m

932m

2. In a long-jump competition, Ruby jumped 4m in the first jump. She jumped 5m in the second jump. What is the difference in distance between the two jumps?

5m - 4m =

5m - 4m

1m

THANK YOU…