Time: 1 hour M.M. 30
Attempt all questions.
Q1: What is the estimated sum of 645 + 876? (1 mark)
(a) 1300
(b) 1400
(c) 1500
(d) 1600
Q2: What is the estimated difference of 812 – 493? (1 mark)
(a) 200
(b) 250
(c) 300
(d) 350
Q3: Which of the following sets of numbers adds up to 24,539? (1 mark)
(a) 5-digit number = 21,000, 3-digit number = 539
(b) 5-digit number = 20,000, 3-digit number = 439
(c) 5-digit number = 22,000, 3-digit number = 539
(d) 5-digit number = 19,000, 3-digit number = 539
Q4: Which of the following is a 3-digit palindrome that can be formed using the digits 1, 2, and 3? (1 mark)
(a) 111
(b) 122
(c) 123
(d) 132
Q5: Which of the following numbers has digits that add up to 14? (1 mark)
(a) 59
(b) 67
(c) 85
(d) 92
Q6: Calculate the digit sums of 3-digit numbers whose digits are consecutive (for example, 234, 345). Do you see a pattern? Will this pattern continue? (2 marks)
Q7: The time now is 02:15. How many minutes until the clock shows the next palindromic time? What about the one after that? (2 marks)
Q8. We are the group of 5-digit numbers between 40,000 and 80,000 such that all of our digits are even. Who is the largest number in our group? Who is the smallest number in our group? Who among us is the closest to 60,000? (2 marks)
Q9: What is the sum of the smallest and largest 5-digit palindrome? What is their difference? (3 marks)
Q10. Digit sum 18. (3 marks)
(a) Write other numbers whose digits add up to 18.
(b) What is the smallest number whose digit sum is 18?
(c) What is the largest 5-digit number whose digit sum is 18?
(d) How big a number can you form having the digit sum 18? Can you make an even bigger number?
Q11. Will reversing and adding numbers repeatedly, starting with a 2-digit number, always give a palindrome? (3 marks)
The Solutions of the Unit Test Here
51 videos|147 docs|23 tests
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