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Banking Exam Preparation (IBPS Exam) – “MULTIPLICATION” Part II
Multiply by 2
Method – 1
Direct multiply
Double each number and carry forward unit digit to next digit
Method – 2
Minus 5
Double each digit less than 5 (a) and double each digit more than 4 after minus 5 (b).
Add 1 to each digit before each (b).
Banking Exam Preparation (IBPS Exam) – “MULTIPLICATION” Part II
Multiply by 3
Step
1. Divide first digit by 2 and remove all digits after point.
2. Minus all digits from 9 but unit digit from 10.
3. We find a new number.
4. Double each digit of new number and add half of next main number’s digit (Ignore Digit after point).
5. Add extra 5 if main digit is odd and 0 if even.
6. Carry forward answer’s digit before unit digit to next digit.
7. Minus 2 from first digit of finding.
E.g. 46357 x 3
Step
1. 4/2 = 2
2. 9 – 4, 9 – 6, 9 – 3, 9 – 5, 10 – 7 = 53643
3. 53643
4. (5 x 2) + 6/2, (3 x 2) + 3/2. (6 x 2) + 5/2, (4 x 2) + 7/2, (3 x 2) + 0/2 = 13, 7, 14, 11, 6
5. 13 + 0, 7 + 0, 14 + 5, 11 + 5, 6 + 5
6. 13, 07, 19, 16, 11 = First digit 2 = 339071
7. Finding 339071 minus 2 from first digit = 1339071
1 | 2 | 3 | 4 | 5 | 6 |
Main Number | Minus 9/10 | Double 2 | Odd/Even | ½ of next digit | 3+4+5 |
0 | 0 | 0 | 0 | 2 | 2 |
| 4 | 5 | 10 | 0 | 3 | 13 |
6 | 3 | 6 | 0 | 1 | 7 |
3 | 6 | 12 | 5 | 2 | 19 |
| 5 | 4 | 8 | 5 | 3 | 16 |
| 7 | 3 | 6 | 5 | 0 | 11 |
339071
Now Minus 2 from first digit 3 – 2 = 1
Answer is 139071
Banking Exam Preparation (IBPS Exam) – “MULTIPLICATION” Part II
Multiply by 4
Same as multiply by 3 but after minus 9/10 not doubled numbers direct add half of next digit.
After finding minus 1 from first digit in place of 2.
E.g. 37485 x 4
1 | 2 | 3 | 4 | 5 |
Main Number | Minus 9/10 | Odd/Even | ½ of next digit | 2+3+4 |
0 | 0 | 0 | 1 | 1 |
3 | 6 | 5 | 3 | 14 |
7 | 2 | 5 | 2 | 9 |
| 4 | 5 | 0 | 4 | 9 |
| 8 | 1 | 0 | 2 | 3 |
5 | 5 | 5 | 0 | 10 |
Now minus 1 from first digit 2 – 1 = 1
Answer is 149940
Banking Exam Preparation (IBPS Exam) – “MULTIPLICATION” Part II
Multiply by 5
1. Take 5 for each odd digit and 0 for each even digit. Now add half of next digit (ignore digits after point)
E.g. 78439 x 5
1 | 2 | 3 | 4 |
Main Number | Odd/Even | ½ of next digit | 2+3 |
0 | 0 | 3 | 3 |
| 7 | 5 | 4 | 9 |
8 | 0 | 2 | 2 |
| 4 | 0 | 1 | 1 |
3 | 5 | 4 | 9 |
| 9 | 5 | 0 | 5 |
Now answer is 392195
2. Multiply by 10 and divide by 2.
E.g. 78439 x 5
78439 x 10 = 784390
784390/2 = 392195
Banking Exam Preparation (IBPS Exam) – “MULTIPLICATION” Part II
Multiply by 6
Write main each digit of main number and add 5 for each odd digit and 0 for each even digit also add half of next digit.
E.g. 7987 x 6
1 | 2 | 3 | 4 |
Main Number | Odd/Even | ½ of next digit | 1+2+3 |
0 | 0 | 3 | 3 |
| 7 | 5 | 4 | 16 |
9 | 5 | 4 | 18 |
| 8 | 0 | 3 | 11 |
7 | 5 | 0 | 12 |
Banking Exam Preparation (IBPS Exam) – “MULTIPLICATION” Part II
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Banking Exam Preparation – ADDITION and SUBTRACTION Part I
Banking Exam Preparation – ADDITION and SUBTRACTION Part II
Banking Exam Preparation – ADDITION and SUBTRACTION Part III
Banking Exam Preparation – “MULTIPLICATION” Part I
