1 x 21, 3 x 7, 7 x 3, 21 x 1
1 x 21, 3 x 7, 7 x 3, 21 x 1
10
x-3-7x=21 -6x=21+3 6x=-24 x=-4
15 = 3 x 521 = 3 x 727 = 3 x 3 x 3hcf of 15 and 21 is 3lcm of 15 and 21 = 15 x 21 / 3 = 105hcf of 105 and 27 = 3lcm of 105 and 27 = 105 x 27 / 3 = 945
21 = 1 x 21, 3 x 7, 7 x 3, 21 x 1.
21 = 1 x 21, 3 x 7, 7 x 3, 21 x 1
1 x 21, 3 x 7, 7 x 3, 21 x 1
1 x 21, 3 x 7, 7 x 3, 21 x 1
10
x-3-7x=21 -6x=21+3 6x=-24 x=-4
3 times what = 63
1 x 21, 3 x 7, 7 x 3, 21 x 1
21 3,7 3 x 7 = 21
3 * 21 = 3*(20 + 1) = 3*20 + 3*1 = 60 + 3 = 63.
3 x 7 x 7 x 11 x 13
3 x 7 = 21 3 x 3 x 11 = 99