Page 30 - NUMINO Challenge_D2

Problem solving Key Points

1 Which of the following represents me? First, calculate using
numerical fractions
I am the same as the result of subtracting one and find the value.
share when dividing one pancake equally among Then, express the
12 people from one share when dividing seven value as an ancient
pancakes equally among 12 people. Egyptian fraction.

2 The following expresses 1 as the sum of different Find the case where
unit fractions by using the proper divisors of 18. the sum of the
proper divisors of 12
is 12.

Find all the proper divisors of 18. 1, 2, 3, 6, 9

Choose the proper divisors that sum up to 18.
3 6 9, 1 2 6 9

Therefore, 1 18 369 3 6 9
18 18 18 18 18

1 1 1 , 1 1269
6 3 2 18

1 2691 1 1 1 .
18 18 18 18 18 9 3 2

Express 1 as the sum of different unit fractions
by using the proper divisors of 12.

27Number and Operations