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