Subtraction of whole numbers with sum less than 20
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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