9. Replace by the smallest digit to make the following divisible by 11. (a) 4 3271 (b) 22 0978 (c) 23 45678 (d) 24729
Answers
Answer:
You need to add 1
Step-by-step explanation:
The formula for dividing 11 is sum of odd digits less sum of even digits. The odd digits are 2+9+8+. 7+0+2 = 19-9 = 10, hence * is equal to 1.
The result of adding the even place digits, 7, 0, and 2, is 9. In order to get 0 or any multiples of 11 when subtracting 9 from a number, we need the sum of the digits in the odd locations. If we add up the numbers in the even places, we get 20 if we take 1 in the unknowable place. Nine from twenty yields eleven, which is a multiple of eleven. Therefore, we must change * to 1.
In mathematics, the only single symbol used to represent a number is a digit. For instance, there are two digits in the number 89: 8 and 9. As a result, in everyday life, digits like 0, 1, 2, 3, 4, 5, 6, 7, 8, and 0 are employed to represent groups of numbers and perform mathematical operations.
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