What is the difference between each pair of numbers?
3 - 1 = 2
6 - 3 = 3
etc.
1 3
3 6
6 10
10 15
How do you get from the first number to the next?
1 answer
3 6
6 10
10 15
How do you get from the first number to the next?
1 answer
1 answer
1 answer
1 answer
7 answers