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| Pregunta | Respuesta |
| Reasonable | An estimate is reasonable if it is close to the actual answer |
| Rounding | To give an approximate value |
| Front-end estimation | A way of rounding numbers. For eg. 324 is rounded off to 300. |
| Prime Number | a number that has 1 and itself Eg: 1,3,5,7,11,13,17,19,23 |
| Composite number | A number that has more than two different factors For eg: 2 x 3= 6 so 6 is a composite number having 2 and 3 as its factors |
| Whole numbers | 0, 1, 2, 3, 5, 6, 7, 8, 9 |
| Common factor | When factors are common (same) for 2 or more numbers. Example: 12 and 16 • The factors of 12 are: 1, 2, 3, 4, 6 and 12 • The factors of 16 are: 1, 2, 4, 8 and 16 So the common factors of 12 and 16 are: 1, 2 and 4 |
| Greatest Common factor (GCF) | Greatest of common factors Example: 12 and 16 • The factors of 12 are: 1, 2, 3, 4, 6 and 12 • The factors of 16 are: 1, 2, 4, 8 and 16 So the common factors of 12 and 16 are: 1, 2 and 4 So, out of 1,2,and 4 = 4 is the greatest.So 4 is GCF |
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