Mathematics Second Term Primary 1

Subject : Mathematics

Term : Second Term

Week : 7

Class : Basic 1 / Primary 1 / Grade 1

Topic :  Subtraction of whole numbers with sum less than 20

Previous Knowledge : The pupils have been taught

Subtraction of whole numbers with sum less than 9

in their previous lesson

Reference Books :

• MAN Mathematics Book 1
• Understanding Mathematics Book 1
• New Method Mathematics Book 1
• Learn Africa Mathematics Book 1

Instructional Materials

• Counters
• Bottle cover
• Abacus
• Match sticks
• Fingers
• Toes
• Oranges
• Ludo

Behavioural Objectives

By the end of the lesson, the learners will be able to

• Subtract or take away two whole numbers
• Subtract or take away numbers whose sums are less than 20
• Recognize Maths symbols like subtraction symbol ➖  or minus ➖ and say what it stands for
• To take away figures when they see the add together symbol

Teaching Resources 

• Counters
• Stones
• Donuts
• Paper bag
• Number cards
• Number chart
• Bottle tops
• Buttons

Content

This symbol ➖ means subtraction

It means take away

or minus

or subtract

or find the difference

Examples in sentences

16 ➖ 2 = 14

17 ➖ 3 = 14

 19 ➖ 6 = 13

17 ➖ 1 = 16

14 ➖ 3 = 11

Presentation :

The topic is presented step by step

Step 1 :The class revises the previous topic

Step 2 : The class teacher introduces the new topic which is counting, reading and identification of Numbers from one to five

Step 3 : Allow learners to give their own ideas and suggestions and corrects them when the needs arise

Evaluation

Answer the following questions

Count the following objects together and answer the questions that follow

17 ➖ 2 =

15 ➖ 4 =

13  ➖ 3 =

14 ➖ 2 =

15  ➖ 3 =

14 ➖ 4  =

17 ➖ 2 =

18 ➖ 1 =

19 ➖ 0 =

20 ➖ 10 =

Conclusion

The class teacher goes round to access, read, marks and does the necessary corrects.

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Subtraction of whole numbers with sum less than 9

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