Q: 77 X 91

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28 = 4 x 777 = 11 x 7 91 = 13 x 7 Great common factor = 4 x 11 x 13 x 7 = 44 x 91 = 4004

It is 91 x 77 cm (36 x 30 in).

7 is the Greatest Common Factor (GCF) Factored into their prime factors: 28 = 2 x 2 x 7 77 = 7 x 11 91 = 7 x 13 The only factor they have in common (other than 1) is 7

7 x 11 = 77 7 x 13 = 91

The first ten positive integer multiples of 77 are: 1 x 77 = 77 2 x 77 = 154 3 x 77 = 231 4 x 77 = 308 5 x 77 = 385 6 x 77 = 462 7 x 77 = 539 8 x 77 = 616 9 x 77 = 693 10 x 77 = 770

1 x 2002, 2 x 1001, 7 x 286, 11 x 182, 13 x 154, 14 x 143, 22 x 91, 26 x 77.

1 x 3003, 3 x 1001, 7 x 429, 11 x 273, 13 x 231, 21 x 143, 33 x 91, 39 x 77

91 x 91 = 8281

1 x 91, 7 x 13, 13 x 7, 91 x 1 = 91

x - 30% of x = 91 → 70% x = 91 → x = 91÷ 70% = 130

If 11 + X = 77, X = 66. What you have to do is 77 - 66, and that = 11!

Multiples are found by multiplying a number by successive counting numbers. 77 x 1 = 77 77 x 2 = 154 77 x 3 = 231 77 x 4 = 308 77 x 5 = 385