# Addition of Two Digit Numbers Under Tens and Units Without Regrouping

Subject :

Mathematics

Term :

First Term

Week:

Week 5

Class :

Primary 3/ Basic 3

Topic : Addition of two digit numbers under Tens and Units

Previous lesson :

The pupils have previous knowledge of introduction to fractions with different shapes like circle , squares, rectangles etc

Behavioural objectives :

At the end of the lesson, the pupils should be able to

• Understand how to arrange two digit figures under tens and Units.
• Explain the process that is involved in simple additions under tens and Units.
• Use pebbles, counters, abacus or other learning materials to solve questions on simple addition of numbers under tens and units

Instructional Materials :

• Wall charts
• Pictures
• Related Online Video
• Flash Cards
• Lagos state scheme of work on Mathematics
• TextBooks
• Workbooks
• Pebbles
• Abacus

Methods of Teaching :

• Class Discussion
• Group Discussion
• Explanation
• Role Modelling
• Role Delegation

Reference Materials :

• Scheme of Work
• Online Information
• Textbooks
• Workbooks
• 9 Year Basic Education Curriculum
• Workbooks

Content :

Addition of 2-digit numbers with renaming

Addition of 2-digit numbers with renaming is solved by using:

the expanded method and,

the direct or short method.

Examples

add 28 and 84 using the:

Expanded method

1.        2 8 = 20 + 8 = 2 8

+84.   =80  +4= 8  4

In the units column, 8 + 4 = 12 units = 10 + 2, which is

1 ten and 2 units. Write 2 units in the units column and

carry 1 ten to the tens column. In the tens column,

1 + 2 + 8 = 11 tens = 10 tens + 1 ten, which is 1 hundred

and 1 ten. Write 1 ten in the tens column and carry

1 hundred to the hundreds column.

9 4 = 90 + 4 9 4

+ 8 9 = 80 + 9 + 8 9

+ 3 =170 + 10 + 3 1 8 3

=183

Addition using direct method or short cut

73 + 37

T U

7 3

+3 7

110

54 + 23

T U

5 4

+2 3

7 7

359 = 300 + 50 + 9

914 = 900 + 10 + 4

800 + 40 + 2 = 842

500 + 60 + 4 = 564

H T U

4 3 8

+ 4 1 1

8 4 9

H T U

8 7 3

+ 1 2 4

9 9 7

Presentation

The topic is presented step by step

Step 1:

The class teacher revises the previous topics

Step 2.

He introduces the new topic

Step 3:

The class teacher allows the pupils to give their own examples and he corrects them when the needs arise

Conclusion

The class teacher wraps up or conclude the lesson by giving out short note to summarize the topic that he or she has just taught.

The class teacher also goes round to make sure that the notes are well copied or well written by the pupils.

He or she does the necessary corrections when and where  the needs arise.

Evaluation

• Add up the following numbers

123 + 58 =

394 + 38=

980 + 33=

456 + 78=

878+ 78=

253+ 409 =

Assignment