Math Olympiad K1_15 on Day:.........Month:..........Year:...........

Total Core =

Question 1: Find the value of 2 + 3 - 4 + 5 - 6 + 8 - 8 + 9

Question 2: Find the value of 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17

Question 3: Find the value of 4 + 5 + 8 + 12 + 13 + 20 - 12

Question 4: If X is 1 digit number. What is the value of X ? 20 - X = 18

Question 5: If X is 1 digit number. What is the value of X ? 24 - X = 20

Question 6: If X is 1 digit number. What is the value of X ? 44 - X = 39

Question 7: Find the value of 4 + 10 + 20 + 18 + 20 - 8

Question 8: Find the value of 10 + 20 + 18 + 2 + 2 + 0 - 50

Question 9: X + X + X = 21 X + Y + Y = 13 Y = ?

Question 10: A study lamp in a room was initially off, when Tong entered the room he pressed the lamp's switch 44 times.
At the instant is the lamp switched on or off ?