Solving Problems: Sealed Solution

In 3/4D, we are creative thinkers. Today, we are holding a Family Blogging Afternoon. Miss Fraser thought it could be a good idea to work with our family members after we have completed our blogging quiz on this number problem.

We have a number of different problem solving strategies that we can use in our maths. Perhaps one of these strategies will help solve today’s problem?



Today’s problem is called Sealed Solution

*This problem comes from the Nrich website

A set of ten cards, each showing one of the digits from 0 to 9, is divided up between five envelopes so that there are two cards in each envelope. The sum of the two numbers inside it is written on each envelope:


What numbers could be inside the “8” envelope?

*There is more than one solution!

Write your solution in a comment. What problem solving strategies did you use?