SUBJECT : MATHEMATICS W.A.L.A: METRIC LENGTH

Days

W.A..L.T:

Content

Plenary

Starter

Task

Homework

**Monday**

To measure length of various objects.

Convert units of length

Resources

Inside out

Learn

mathematics Book 6, page

35

Ruler, Tape rule, meter rule.

__METRIC LENGTH__Length is a measurement that tells how long or wide something is.

In the olden days people measure length of objects by using various parts of the body such as arm, foot, palms etc. But all these does not give accurate measurements.

Today people use instruments like ruler, tape rule, meter tape to accurately measure the length of objects. The standard unit of length measurements s metre (m)

CONVERSION OF METRIC LENGTH

10 millimetres (mm) = 1 centimeter (cm)

10 centimeters = 1 decimetre (dm)

10dm = 1 meter (m)

1000mm = 1m

100cm = 1m

1000m = 1 kilometer (km)

Examples

Solutions

a. The length of line a is 6cm

b. The length of line b is 2.5cm

Pupils should be Able to ;

Define length, find the various units of measuring length and also use a ruler to measure length of certain objects.

Begin the lesson by showing pupils a video about how length is being measured.

STARTER

The pupils are given a Worksheet which contains different lines, object and animals. Then with the aid of ruler they are to measure their lengths.

EXERCISES

Inside out

mathematics Book 6, page 36, Exercise 5.1 (1a-d) and (2a-d)

**Tuesday**

Add units of length

Resources

Inside out

Learn

mathematics Book 6, pages

36

Ruler, Tape rule, meter rule.

__ADDITION OF METRIC LENGTH__Addition of metric length is similar to basic addition arithmetic. But note:

10mm = 1cm, 100cm = 1m, 1000m = 1km

EXAMPLES

1. Add 10cm 5mm to 15cm 7mm and 12cm 5mm

Solution

2. 5m 15cm 7mm + 4m 48cm 9mm + 6m 65cm 8mm

Solution

PLENARY

Pupils should be able to add various units of lengths together.

STARTER

Start the lesson by asking them questions on units of length and perform basic addition operation.

EXERCISES

Inside out mathematics Book 6, page 36 exercise 5.2 (1 - 5)

Inside out mathematics Book 6, page 36 exercise 5.2 (6 - 9)

**Wednesday**

Subtract metric lengths

Resources

Inside out

Learn

mathematics Book 6, pages

37

Ruler, Tape rule, meter rule.

__SUBTRACTION OF METRIC LENGTH__Subtraction of metric length is similar to basic subtraction operation. But note:

10mm = 1cm, 100cm = 1m, 1000m = 1km

EXAMPLES

1. Subtract 5cm 9mm from 9cm 6mm

Solution

Pupils should be able to subtract various units of lengths.

STARTER

Begin the lesson by asking them questions on simple subtractions problems.

EXERCISES

Inside out mathematics Book 6, page 37 exercise 5.3 (1 - 5)

Inside out mathematics Book 6, page 36 exercise 5.3 (6 - 10)

**Thursday**

Multiply metric length

Divide metric length

Resources

Inside out

Learn

mathematics Book 6, pages

38 - 39

Ruler, Tape rule, meter rule.

**MULTIPLICATION OF METRIC LENGTH**

EXAMPLE

1. 3m 75cm 9mm x 3

Solution

DIVISION OF METRIC LENGTH

EXAMPLE

2. 26m 75cm 2mm ÷ 8

PLENARY

Pupils should be able to multiply and divide various units of length.

STARTER

Begin the lesson by doing the first example for them.

EXERCISES

Inside out mathematics Book 6, page 37 exercise 5.4 (1 - 3) and 5.5 (1 – 3)

Inside out mathematics Book 6, page 37 exercise 5.4 (4 - 6) and 5.5 (4 – 7)

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