can anyone make 3 using two 2's???
ONE ANSWER IS
2^0 + 2=3
IF YOU HAVE ANY ANSWER POST IT AS COMMENT........
EASY MULTIPLICATION TRICK
Method for multiplying numbers where the first figures are the same and the last figures add up to 10
FOR EG:
32 x 38 = 1216
Both numbers here start with 3 THEY ARE SAME and the last
figures (2 and 8) add up to 10
So we just multiply 3 by 4 (the next number up)
to get 12 for the first part of the answer.
And we multiply the last figures: 2 x 8 = 16 to
get the last part of the answer.
· And 81 x 89 = 7209
We put 09 since we need two figures as in all the other examples
FOR EG:
32 x 38 = 1216
Both numbers here start with 3 THEY ARE SAME and the last
figures (2 and 8) add up to 10
So we just multiply 3 by 4 (the next number up)
to get 12 for the first part of the answer.
And we multiply the last figures: 2 x 8 = 16 to
get the last part of the answer.
· And 81 x 89 = 7209
We put 09 since we need two figures as in all the other examples
MATHS PUZZLE
solve this
Village A has a population of 70,000, which is decreasing at the rate of 1000 per year.
Village B has a population of 52000, which is increasing at the rate of 400 half yearly
.How many years will they take to reach same population
try its easy .............
leave your answer as a comment......
ANSWER
let,after x yrs their will b same...
after x yrs in A population decreases 1000x & in B population increases (2*400*x)=800x .
So,
70000-1000x = 52000 + 800x
x= 10
Village A has a population of 70,000, which is decreasing at the rate of 1000 per year.
Village B has a population of 52000, which is increasing at the rate of 400 half yearly
.How many years will they take to reach same population
try its easy .............
leave your answer as a comment......
ANSWER
let,after x yrs their will b same...
after x yrs in A population decreases 1000x & in B population increases (2*400*x)=800x .
So,
70000-1000x = 52000 + 800x
x= 10
SIMPLE TRICKS TO MULTIPLY
Multiply by 5: Multiply by 10 and divide by 2.
Multiply by 6: Sometimes multiplying by 3 and then 2 is easy.
Multiply by 9: Multiply by 10 and subtract the original number.
Multiply by 12: Multiply by 10 and add twice the original number.
Multiply by 13: Multiply by 3 and add 10 times original number.
Multiply by 14: Multiply by 7 and then multiply by 2
Multiply by 15: Multiply by 10 and add 5 times the original number, as above.
Multiply by 16: You can double four times, if you want to. Or you can multiply by 8 and then by 2.
Multiply by 17: Multiply by 7 and add 10 times original number.
Multiply by 18: Multiply by 20 and subtract twice the original number (which is obvious from the first step).
Multiply by 19: Multiply by 20 and subtract the original number.
Multiply by 24: Multiply by 8 and then multiply by 3.
Multiply by 27: Multiply by 30 and subtract 3 times the original number (which is obvious from the first step).
Multiply by 45: Multiply by 50 and subtract 5 times the original number (which is obvious from the first step).
Multiply by 90: Multiply by 9 (as above) and put a zero on the right.
Multiply by 98: Multiply by 100 and subtract twice the original number.
Multiply by 99: Multiply by 100 and subtract the original number.
Multiply by 6: Sometimes multiplying by 3 and then 2 is easy.
Multiply by 9: Multiply by 10 and subtract the original number.
Multiply by 12: Multiply by 10 and add twice the original number.
Multiply by 13: Multiply by 3 and add 10 times original number.
Multiply by 14: Multiply by 7 and then multiply by 2
Multiply by 15: Multiply by 10 and add 5 times the original number, as above.
Multiply by 16: You can double four times, if you want to. Or you can multiply by 8 and then by 2.
Multiply by 17: Multiply by 7 and add 10 times original number.
Multiply by 18: Multiply by 20 and subtract twice the original number (which is obvious from the first step).
Multiply by 19: Multiply by 20 and subtract the original number.
Multiply by 24: Multiply by 8 and then multiply by 3.
Multiply by 27: Multiply by 30 and subtract 3 times the original number (which is obvious from the first step).
Multiply by 45: Multiply by 50 and subtract 5 times the original number (which is obvious from the first step).
Multiply by 90: Multiply by 9 (as above) and put a zero on the right.
Multiply by 98: Multiply by 100 and subtract twice the original number.
Multiply by 99: Multiply by 100 and subtract the original number.
Square 2 Digit Number:WITH UP-DOWN Method
Square a 2 Digit Number, for this example 37:
> Look for the nearest 10 boundary
> In this case up 3 from 37 to 40.
> Since you went UP 3 to 40 go DOWN 3 from 37 to 34.
> Now mentally multiply 34x40
> The way I do it is 34x10=340;
> Double it mentally to 680
> Double it again mentally to 1360
> This 1360 is the FIRST interim answer.
> 37 is "3" away from the 10 boundary 40.
> Square this "3" distance from 10 boundary.
> 3x3=9 which is the SECOND interim answer.
> Add the two interim answers to get the final answer.
> Answer: 1360 + 9 = 1369
> Look for the nearest 10 boundary
> In this case up 3 from 37 to 40.
> Since you went UP 3 to 40 go DOWN 3 from 37 to 34.
> Now mentally multiply 34x40
> The way I do it is 34x10=340;
> Double it mentally to 680
> Double it again mentally to 1360
> This 1360 is the FIRST interim answer.
> 37 is "3" away from the 10 boundary 40.
> Square this "3" distance from 10 boundary.
> 3x3=9 which is the SECOND interim answer.
> Add the two interim answers to get the final answer.
> Answer: 1360 + 9 = 1369
TRICK TO SUBSTRACT NUMBER EASILY
this is an easy trick
To subtract a large number from 1,000
subtract all but the last number from 9, then subtract the last number from 10
1000
-547
step1: subtract 5 from 9 = 4
step2: subtract 4 from 9 = 5
step3: subtract 7 from 10 = 3
answer: 453
To subtract a large number from 1,000
subtract all but the last number from 9, then subtract the last number from 10
1000
-547
step1: subtract 5 from 9 = 4
step2: subtract 4 from 9 = 5
step3: subtract 7 from 10 = 3
answer: 453
