What is 100? • • It is 10 groups of 10 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 20 groups of 5 70, 75, 80, 85, 90, 95, 100 50 groups of 2 It is the sum of the first nine prime numbers 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100 1 2 3 4 5 6 7 8 9 2+3+5+7+11+13+17+19+23 = 100