The leading number sequence is 1, 2, 3, 4, 5, 6, 7, 8, 9,
10
The middle number sequence is 4, 8, 12, 16, 20, 24, 28, 32, 36, 40 The ending number sequence is 8, 16, 24, 32, 40, 48, 56, 64, 72, 80
Free challenging math problems for Kids (1st grade, 2nd grade, 3rd grade, 4th grade, 5th grade, 6 grade and 7th grade)