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# Sealed Solution

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Age 7 to 11

Challenge Level

*Sealed Solution printable sheet*

Here is a set of ten cards, each showing one of the digits from 0 to 9:

The ten cards are 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?

*Thank you to Alan Parr who inspired this task.*

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

Roll two red dice and a green dice. Add the two numbers on the red dice and take away the number on the green. What are all the different possible answers?