1. Place the number puzzles http://hench-maths.wikispaces.com

2. Instructions These problems can either be displayed for a whole class on a smart board or data projector. Students could be given the file and “play” with each puzzle in edit mode by selecting and moving the textboxes containing the numbers. (they can’t move the numbers in view-show mode)

4. HAITCH Use the numbers 1 to 7, once only so that all three lines have the same total. How many different possibilities are there? Prove that 6 and 7 cannot be in the same line. Prove that the centre of the H must be even. 1 234567

5. CROSS CUT Use the numbers 1 to 6, once only The row of 3 must add up to the column of 4 Prove that the centre number must be odd How many different solutions are there? 123456

6. IT ADDS UP Use the numbers 1 to 5, once only The row of 3 must add up to the column of 3 Prove that the centre number must be odd How many different solutions are there? 12345

7. EQUALIZING Use the numbers 1 to 6 once only Line totals must be equal Establish that there are only 4 solutions Prove that the numbers 1 and 6 must be together 123456

8. DEDUCT & DEDUCE Use the numbers 1 to 6 once only. Each circle is the positive difference between the two circles below it. Prove that there are only four different ways of doing this if reflections are not counted. 123456

9. Number Go Round Place the numbers 1 to 8 in each space so that all sums are correct 1 234 56 -- -+ == += 78 MAV

10. Number Tiles Place the numbers 1 to 9 onto the squares so that they make a correct addition sum 1 234 56789 MAV

11. Arithmagon 1 The number in the square is the sum of the two circle numbers Can you place the correct numbers 123456 13 8 9 78910 MAV

12. Arithmagon 1 The number in the square is the sum of the two circle numbers Can you place the correct numbers 123456 10 5 13 78910 MAV

13. Arithmagon 1 The number in the square is the sum of the two circle numbers Can you place the correct numbers 123456 5 5 4 78910 MAV

14. Arithmagon 1 The number in the square is the sum of the two circle numbers Can you place the correct numbers 123456 13 12 11 78910 MAV

15. 1 to 19 1 1 2 1 1 1 18 3 4 5 6 7 9 8 10 11 12 14 13 15 16 17 19 Place the numbers from 1 through 19 in the circles so that the numbers in every 3 circles on a straight line total 30.