Page 312 - Start Up Mathematics_8 (Non CCE)

2. Take any number. Add 2, now multiply the result by 3, then subtract 6 and lastly divide it by 3.
What do you get?
3. Think of a number. Double it. Add 18. Take away 10. Halve it. Take away 4. Now what do you get
and why?
4. SUDOKU (3 × 3) 4 8 7 5 1 4 8 2 6
Fill the grid so that every horizontal row, every vertical
column and every 3 × 3 box contains the digits 1 to 9, 1 2 6 8 9 2 3
without repeating the numbers in the same row, column or
box. (You cannot change the numbers already written in the 3 6
grid). 7 6 2
4 8 5 9
6 4
7 5 2 8 9 6 3

5. Place the digits 1 to 9 in the circles so that the sum of three
numbers on each diameter equals 15.

6. Find the value of A, B, C, D and E to complete the number
triangle given below:

7. Fill in the circles with the correct digits. 6 3 4

×

4 8 X

0 41

8. Fill in the blank squares with 2-digit prime numbers so that 13 17
the sum of the numbers in both the horizontal and vertical
squares is 161.

9. The numbers 1 to 9 have been arranged in a pattern of
triangles so that the sum along each side of the triangle is
22. Find another such arrangement of the numbers to make
the totals equal.

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