(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
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
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
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.
The 12 factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90. The factor pairs of 90 are 1 x 90, 2 x 45, 3 x 30, 5 x 18, 6 x 15, and 9 x 10. The prime factors of 90 are 2, 3, 3, and 5. The distinct prime factors of 90 are 2, 3, and 5. The prime factorization of 90 is 2 x 3 x 3 x 5 or, in exponential form, 2 x 32 x 5. The factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90. The prime factors of 90 are 2, 3, 5.