Tricky twenty

Place the numbers 1 to 9 in the boxes so that each side of the triangle adds up to 20.

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Much trickier than it first looks, with many possible options to choose from. Some time is needed to complete this correctly.

Replace the hexagons in the calculation with numbers: logical thinking needed.

Find the mathematical words in these anagrams.

Turn your calculator upside down to read the words!

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