Approximation
We know that the digits of a number, one by one in order from left to right decrease in value rapidly. Let us illustrate it by examples. Mass of a gold ornament is 23.473 g. Round off to (i) two decimal places, (ii) one decimal place. 23.473 g = (2 x 10) + (3 x 1) + The successi..
We know that the digits of a number, one by one in order from left to right decrease in value rapidly. Let us illustrate it by examples. Mass of a gold ornament is 23.473 g. Round off to (i) two decimal places, (ii) one decimal place. 23.473 g = (2 x 10) + (3 x 1) + The successi..To find the sum of a number of terms in Arithmetical Progression:
Let a=first term, d = common difference, l=t n =last term, s = required sum. Then, Writing the series in the reverse order, Adding together the two series, ..
Let a=first term, d = common difference, l=t n =last term, s = required sum. Then, Writing the series in the reverse order, Adding together the two series, ..Summary
We use specific number of digits to denote the value of a number to a certain degree of accuracy. For a number between 0 and 1, the successive zeros after the decimal are not significant. For a number with a decimal point, the final zeros ar..
We use specific number of digits to denote the value of a number to a certain degree of accuracy. For a number between 0 and 1, the successive zeros after the decimal are not significant. For a number with a decimal point, the final zeros ar..A two-digit number is 9 less than the number obtained by reversing its..
A two-digit number is 9 less than the number obtained by reversing its digits. Find the original number if it is 5 times the sum of its digits => 64 or 46 or 54 or 45..
A number consists of two digits whose sum is 7. When 9 is added to th..
A number consists of two digits whose sum is 7. When 9 is added to the number, the digits are reversed. What is the number? => 34 or 43 or 52 or 61..
The statement, "The difference of a number and its reversal of a two d..
The statement, "The difference of a number and its reversal of a two digit number is a multiple of 9" is: => True or False..
The sum of the digits in a two digit number is 10. If the digits are r..
The sum of the digits in a two digit number is 10. If the digits are reversed, then the value of the number is reduced by 36. Find the number. => 64 or 73 or 37 or 46..
When the digits of a two-digit number are reversed, the new number is ..
When the digits of a two-digit number are reversed, the new number is 7 more than twice the original number. Find the original number if the sum of its digits is 11. => 30 or 77 or 83 or 38..
Use digits and a decimal point to write the number 'Nine hundred two a..
Use digits and a decimal point to write the number 'Nine hundred two and thirty seven thousandths'. => 90.2037 or 902.37 or 902.037 or 9020.37..
How many 5 digit identification numbers can be made out of digits 0 - ..
How many 5 digit identification numbers can be made out of digits 0 - 9, if the numbers can be used only once? => 30240 or 27216 or 10000 or 252..
Result
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