(8 x 7) + (6 x 5) + 4 + 3 - 2 - 1
= 56 + 30 + 7 - 3
= 86 + 4
= 90
If you want only whole numbers, and they are all different, then: 1 × 2 × 5 × 9 = 90 Otherwise, with whole numbers which are not all different: 1 × 1 × 1 × 90 = 90 1 × 1 × 2 × 45 = 90 1 × 1 × 3 × 30 = 90 1 × 1 × 5 × 18 = 90 1 × 1 × 6 × 15 = 90 1 × 1 × 9 × 10 = 90 1 × 2 × 3 × 15 = 90 1 × 2 × 5 × 9 = 90 1 × 3 × 3 × 10 = 90 1 × 3 × 5 × 6 = 90 2 × 3 × 3 × 5 = 90 Once you start allowing fractions, there are infinitely many such 4 number combinations, eg ½ × 2 × 9 × 10
This is easier if the mixed number is converted to an improper fraction: 1 2/3 = (1×3+2)/2 = 5/3 → 1 2/3 × 90 = 5/3 × 90 = 5 × 30 = 150.
1-8-4-3-6-5-7-2
360
90/2 = 45/3 = 15/3 = 5/5 = 1 2 x 3 x 3 x 5 = 90
The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90.The prime factorisation useful for finding the factors of 90, and the lowest common multiple and highest common factor of 90 with other numbers is 90 = 2 x 3² x 5.The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90.The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45 and 90.The factors of 90 are: 1, 2, 3, 5, 9, 10, 18, 30, 45, & 90
3 * 6 * (1 + 4) - 2 = 18 * 5 - 2 = 90 - 2 = 883 * 6 * (1 + 4) - 2 = 18 * 5 - 2 = 90 - 2 = 883 * 6 * (1 + 4) - 2 = 18 * 5 - 2 = 90 - 2 = 883 * 6 * (1 + 4) - 2 = 18 * 5 - 2 = 90 - 2 = 88
Factors: 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 81: 1, 3, 9, 27, 81 82: 1, 2, 41, 82 83: 1, 83 84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 85: 1, 5, 17, 85 86: 1, 2, 43, 86 87: 1, 3, 29, 87 88: 1, 2, 4, 8, 11, 22, 44, 88 89: 1, 89 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 Prime factors: 80: 2, 5 81: 3 82: 2, 41 83: 83 84: 2, 3, 7 85: 5, 17 86: 2, 43 87: 3, 29 88: 2, 11 89: 89 90: 2, 3, 5
1.6667
1. Factorise 72 and 90. 2 Find the greatest common factor. 3. Divide both, 72 and 90 by their gcf. So, 72 = 2*2*2*3*3 90 = 2*3*3*5 and their gcf = 2*3*3 Then 72/gcf = 2*2 = 4 and 90/gcf = 5 So 72/90 = 4/5
The term common factors specifically refers to the factors shared by two or more numbers.The factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90.
2 x 3 x 3 = 18 2 x 3 x 5 = 30 2 x 3 x 3 x 5 = 90, the LCD 1/18 = 5/90 1/30 = 3/90 5 - 3 = 2/90 = 1/45