Explain how using basic facts can help you find 10x20x30x40 mentally.
Answers
Answered by
6
To multiply
10×20×30×40
As we can see that each number has a zero at end.
So we can count the total number of zeros , as here we count there are 4 zeros.
Now we multiply the numbers other than zeros of the number.
So
1×2×3×4
1 times 2 is 2
2 times 3 is 6
And
6 times 4 is 24
Now behind this result we put the number of zeros we counted.
4 zeros
Hence we get
240000 as final result.
So final answer is 240000, this is how we do it mentally.
Answered by
1
As each number has a four zero at end.
Now we multiply the numbers other than zeros of the number.
Hence 1 × 2 × 3 × 4 = 24
Now, we have to put the number of zeros we counted.
That is 4 zeros should be placed.
Hence, we will get 240000 as final answer.
Similar questions
Math,
6 months ago
India Languages,
6 months ago
Political Science,
6 months ago
Math,
1 year ago
Computer Science,
1 year ago
English,
1 year ago