UK Junior Mathematical Challenge

1.

Gill was surprised this year to discover that a thousand million, (the equivalent of a US billion) is sometimes called a gillion! Which of the following represents a gillion in figures:

3.

In Birmingham, on the day of the last UK JMC (26 April, 1994) the sun rose at 0550 and set at 2041. For how long, in hours and minutes, was it above the horizon?

5.

You have to make up a sum using two different numbers chosen from 6, 8 and 72, and one operation chosen from +, -, and . For example, choosing 8, 6 and + gives you 8+6, a sum whose `answer' is 14. Which of the options below is not a possible `answer'?

8.

What is the units digit of the product of 12345679 and 63?

9.

Peter is working out a sequence of numbers. To get the next number in the sequence he trebles the previous number and adds one. For example if his first number was 10, his second number would be 31, his third would be 94, and so on. In fact, the fifth number in his sequence was 445. What was his first number?

10.

in notes weighs 1.3kg. About how much does one note weigh?

19.

If five sixths of a number is sixty, what is three-quarters of it?