# Use factors of a number to aid mental computation involving multiplication and division, eg to multiply a number by 12, first multiply the number by 6 and then multiply the result by 2

 1 Number Detectives: Prime a + prime b=15 2 Number Detectives: b-a=8, ab=20 3 Number Detectives: a+b=19, ab=84 4 Number Detectives: a+b=13, ab=42 5 Number Detectives: a+b=12, ab=32 6 Number Detectives: A number + its square = 30 (2 integers) 7 Number Detectives: a+b=15 Highest value of product? 8 Number Detectives: Sum of 4 consecutive odd nos = 40 9 Number Detectives: Sum of 4 consecutive odd nos = 120 10 Number Detectives: Sum of 4 consecutive even nos = 60 11 Number Detectives: ab= 126 a+b= 25 12 Number Detectives: Sum of 4 consecutive odd nos = 80 13 Number Detectives: a+b=17, ab=-60 14 Number Detectives: a+b=55, ab=484 15 Number Detectives: a+b=133, ab=1000 16 Number Detectives: 2 prime numbers-sum =1 more than 8 squared 17 Number Detectives: prime cubed + prime = 127 18 Number Quest - complete number sentence 19 Logical Leaps - sum and product 20 Logical Leaps - sum and product 21 Logical Leaps - sum and product 22 Logical Leaps - product of consecutive numbers