4, 8, 12, 16, 20
12.
81624324048566472808896104112120128136144152160168176184192200208216224232240248256264272280 .......................
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
20, 40 60, 80 and keep adding 20 until you get to 1400.
Everything up to and including 20.
66, 132, 198, 264, 330, 396, 462.
' 1 ' is a factor of every whole number . . . . . 100 of them' 2 ' is a factor of every even number . . . . . 50 of them' 3 ' has 33 multiples up to 100 . . . . . 33 of them' 4 ' has 25 multiples up to 100 . . . . . 25 of them' 5 ' has 20 multiples up to 100 . . . . . 20 of them' 6 ' has 16 multiples up to 100 . . . . . 16 of them' 7 ' has 14 multiples up to 100 . . . . . 14 of them' 8 ' has 12 multiples up to 100 . . . . . 12 of them' 9 ' has 11 multiples up to 100 . . . . . 11 of themTotal . . . . . . . . . . . . . . . . . . . . . . . . . 281 one-digit factors in all whole numbers 1 to 100 .
4, 8, 12, 16 and 20
10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
All the multiples of 5 between 1 and 51 are: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 These add up to 275.
100 is the least common multiple of 20 and 25.
Oh honey, multiples of 25 up to 1000? That's easy peasy lemon squeezy. You've got 25, 50, 75, 100, all the way up to 1000. Just keep adding 25 each time and you'll be counting those multiples like a pro.