First Term Lesson Note for Week Four
Class: Primary 3
Subject: Mathematics
Topic: Ordering of Whole numbers
Duration: 80 minutes
Period: Double Periods
Reference Book :
- New Method Mathematics by C. F. Oredugba et. al Published by Learn Africa
- Lagos State Unified Schemes of Work for Primary Schools (Primary 1 – 3)
- Online Resources
Instructional Material:
Behavioural Objectives : By the end of the lesson, learners will be able to :
i. Define Ordering of whole numbers in ascending and descending orders
ii. Explain ordering of whole numbers using symbols known as inequalities
iii. Compare two or more numbers using inequalities signs ( >, < or = ).
Previous Knowledge: Learners are familiar with counting and writing of Numbers in words and in figures.
Content:
Ordering of Numbers is the arrangement of number in order of smallest to the largest ( ascending order) or largest to the smallest ( descending order)
Ordering of Numbers involves
i. re-arranging using either ascending order or descending order
ii. Using inequality sign/ symbols.
To order a number, we use the place value of Numbers to determine the bigger number or the smaller number when comparing numbers.
For examples : To determine the larger number between the given numbers, compare each values using their place value, hundred, tens and unit.
i. 571 ___________________ 413. (considering from LHS 5 is hundred while on the RHS 4 is hundred, therefore since 5 is greater than 4, then 571 is greater than 413.)
ii. 705 ______________________ 784
705 is less than 784.
iii. 657 _____________________ 653
657 is greater than 653.
We can also compare numbers by using symbols called inequality.
< – Less than (formed by folding left elbow)
– Greater than (formed by folding right elbow)
For examples: Put >, < or = in the gap to compare number.
i. 35 < 53 ( This is read as 35 is less than 53)
ii. 583 > 353 ( Comparing the place values of each digits, 5 from left hand is hundred while 3 from right hand is hundred, then 583 is greater than 353)
iii. 772 = 700 + 72 ( After adding the values from right we have 772 which is the same value as the number on the left hand side. Then we write equal to sign.)
Arrange these numbers in ascending order ( smallest to largest)
i. 234, 231, 232, 233 = 231, 232, 233, 234
ii. 725, 380, 461, 473 = 380, 461, 473, 725
Arrange the following numbers in descending order ( from largest to smallest)
i. 450, 230, 507, 220 = 507, 450, 230, 220
ii. 929, 982, 972, 919 = 982, 972, 929, 919
Presentation Steps:
Step 1: The teacher revises the previous lesson with the learners by asking questions.
Step 2: He/ she introduces the new topic by explaining ordering of numbers.
Step 3: He/ she then define ascending order and descending order of number with series of examples.
Step 4: The teacher then explain the concept of comparing number using inequality symbols for greater than and less than.
Evaluation:
Write “greater than” or “less than” in the gap
1. 214 is _________________________ 314
2. 800 is _________________________ 500
3. 954 is __________________________ 955
4. 139 is ________________________ 300
5. 865 is ________________________ 658
Write the symbol ( >, < or =) in the gap:
6. 344 _______ 359
7. 361 _______ 163
8. 131 + 100 _______ 231
9. 299 _______ 259
10. 338 _______ 383
Conclusion: At the end of the lesson, the teacher collects the learners notebooks for marking and makes necessary corrections
Assignment:
Arrange the following numbers in order from smallest to the largest:
1. 299, 195, 251, 157 =
____________________________________
2. 731, 657, 658, 911 =
____________________________________
3. 383, 381, 384, 382, 385 =
_____________________________________
Arrange the following numbers from the largest to the smallest:
4. 587, 589, 586, 588, 585 =
__________________________________________
5. 231, 163, 344, 587, 490 =
_________________________________________
6. 157, 808, 553, 352 =
_________________________________________