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If you write plus signs between each of the digits $1$ to $9$, this is what you get:
$1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45$
However, if you alter where the plus signs go, you could also get:
$12 + 3 + 45 + 6 + 7 + 8 + 9 = 90$
Can you put plus signs in so this is true?
$1\;$ $2\;$ $3\;$ $4\;$ $5\;$ $6\;$ $7\;$ $8\;$ $9\;$ $= 99$
How many ways can you do it?These two group activities use mathematical reasoning - one is numerical, one geometric.
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
EWWNP means Exploring Wild and Wonderful Number Patterns Created by Yourself! Investigate what happens if we create number patterns using some simple rules.