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How many addition signs needed to get the sum of 99 and two similar puzzles

thumb how many addition signs needed to make sum 99 puzzle

How many addition signs are to be placed between the digits of number 987654321 to get a total of 99, and where should they be placed? Time limit 10 minutes. In part 2 and 3 of the puzzle, use digits 1 to 9 each only once to form numbers sum of which is 99. Part 2: how many ways can you do it? Part 3: find the number of ways this can be done using minimum number of addition signs. For the last two parts of the puzzle there is no time limit...

Move 2 matchsticks to make 6 squares and move 8 matchsticks to make 6 squares - a pair of matchstick puzzles

thumb move 2 matches to make 6 squares matchstick puzzle

Solve two puzzles, both to form a 6 square matchstick figure. In the first puzzle, form the 6 squares by moving 2 matches and in the second puzzle moving 8 matches. Time to solve both puzzles is 10 minutes. Solve by thinking in radically new way...


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