T he Main Challenge
Here’s a 7-part challenge to test your basic arithmetic knowledge:
- What is 56 divided by 14?
- (1 + 11) + (20 – 4) = ?
- Find which one of these is a factor of 14. Is it 3, 5, 7 or 10?
- What is the next number? 15, 30, 45, 60, …
- 10,000 × 0.001 = ?
- (2 + 3) – (4 – 9) = ?
- What is the sum of 0.81 and 0.5?
Can you get 7 out of 7 correct?
The 7puzzle Challenge
The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.
The 2nd & 5th rows contain the following fourteen numbers:
6 7 8 16 17 21 28 48 50 55 63 64 81 84
Find THREE sets of three different numbers that have a sum of 100.
The Lagrange Challenge
Lagrange’s Four-Square Theorem states that every positive integer can be made by adding up to four square numbers.
For example, 7 can be made by 2²+1²+1²+1² (or 4+1+1+1).
There are FIVE ways of making 103 when using Lagrange’s Theorem. Can you find them?
The Mathematically Possible Challenge
Using 5, 7 and 10 once each, with + – × ÷ available, which is the ONLY number it is possible to make from the list below?
50 51 52 53 54 55 56 57 58 59
#NumbersIn50s
The Target Challenge
Can you arrive at 103 by inserting 1, 2, 6 and 8 into the gaps on both lines?
- ◯²+◯²+◯²–◯² = 103
- (◯+◯+◯)²–half(◯²) = 103
Answers can be found here.
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