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Aptitude Day 4



Answers of Day 3:  1.  360 * 17 = 360*(20-3)  = 7200 - 1080 = 6120
                                 2.  8756 * 99999 = 8756 * (100000-1) = 875591244
                                 3.  18888 * 999 = 18888 * (1000-1) = 18869112
                                 4.   5659 * 1000001 = 5659 * (1000000 + 1) =  5659005659

Unit Digit:

Example: Unit digit of the sum is 4938 + 8942 + 3937 + 4856 + 29393 = 6
           
Solution: 8+2=10, 0+7=7, 7+6=13, 3+3= 6. Add only the unit digit of the numbers, when it ends up in 2 digits again consider only the unit digit to add to the next number as shown above.


Problems to solve

Find the unit digit of the sum in the following

1. 25086+4271938+93728+3780967 = ?

2. 857064+889775+96369+687477 = ?

3. 527639+9992499+7488329+32516922 = ?

4. 739876+62259+669932+9759611 = ?

Answers are here Aptitude Day 5

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