alleryStart learning →A student writes 8*3 and wants a multiple of 11. Which digit must * be?
A0
B3
C5
D8
Answer & Solution
Correct answer: A. 0
The alternating sum is 8 - * + 3 = 11 - *, which is a multiple of 11 only when * is 0, and 803 = 11 x 73.
Keep practising Factors and Multiples
Browse all Factors and Multiples questions for Olympiad (Class 7), or explore more Mathematics topics.
Related questions
48 mangoes and 72 apples go into identical baskets, none left over. What is the most baskeWhat least number must be added to 2,345 to make a multiple of 9?How many multiples of 9 are there from 1 to 100?Among 2-digit numbers that both 3 and 8 divide, which is the greatest?The product of two numbers is 1,800 and their HCF is 6. What is their LCM?Two numbers in the ratio 3 : 4 have HCF 5. Find the LCM.Find the smallest number into which 4, 6 and 10 all divide.Find the highest common factor of 18, 24 and 30.