A chimney sweep has 7 rods - they are 5.1m, 4.5m, 2.7m, 2.1m, 1.2m, 0.9m, 0.6m. Which five rods will reach exactly to the top of a 12 metre chimney?
5.1 + 2.7 + 2.1 + 1.2 + 0.9 = 12.
If possible fill + or - for o and make this true, if not possible then provide the reasoning...
1 o 1/2 o 1/3 o 1/4 o 1/5 o 1/6 o 1/7 o 1/8 o 1/9 o 1/10 o 1/11 o 1/12 = 0
If you have sticks which measure 1, 2, 3, 4, 5, 6, 7, 8 and 9 cm (one of each). How many different triangles can you make using three of the sticks?
Arrange all the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 to give four different square numbers. (You make a square number when you multiply something by itself, so 49 is square because it is 7 times 7)
Which number will replace the "?" and complete the sequence?
1; 1; 2; 4; 3; 9; 4; 61; 5; 52; 6; 63; 7; ?
