When should we multiply? - We should multiply when we need to add the same number multiple times. - To multiply two digit numbers, we multiply each digit of the top number by each digit of the bottom number and add the results, placing them in the correct columns. - For example, to multiply 534 by 46, we multiply each digit in 534 by 6 and 4, placing the results in columns and adding them up to get 24564.

1. When should we multiply?
When we need to add the same
number many times, we need to
multiply

2. Standard Algorithm (long)
multiplication method

3. Multiplyby2digitnumber
Ex: 5 3 4 X 4 6
Step 1 Write theproblem – liningup the place values ( ones under ones) and tens
under tens
X
5 3 4 4 6

4. X
5 3 4
4 6
Step 2
Multiplythe bottom number in the ones palceby the topnumber in the ones
place, tens placeand hundreds place.
4 X 6 = 4
2
3 X 6 =18 +2= 2 0
5 X 6 = 30 +2 = 3 2

5. X
5 3 4
4 6
Step 3
As we are going to multiplyby tens place number 0 shouldbe addedin ones
placeof answer
3 2 0 4
0
2 2

6. X
5 3 4
4 6
Step 4
Multiply the bottom number in the tens place by the top number in the ones place , tens place and hundreds
place.
3 2 0 4
0
2 2
3 X 4 = 12 +1 = 1 3
4 X 4 = 6
1
5 X 4= 20+1 = 2 1

7. X
5 3 4
4 6
Step 4
Add the numbers in answer part
3 2 0 4
2 1 3 6 0
2 2
1 1
+
4
6
5
4
2

8. 5 3 4 X 4 6 = 24564

9. 2 1 7 X 5 3
Answer 1 1,5 0 1