Errata – Number Properties, 2nd Edition
Cover for 2nd Edition
2.0
| Page | Location | Description | Erroneous Text | Correction |
|---|---|---|---|---|
| 36 | Bottom | x divisibility check (graphics swapped) | 6 ÷ 12 (etc.) | 6 ÷ 3 (etc.) {as shown on p. 38} |
| 38 | Middle | x divisibility check (graphics swapped) | 6 ÷ 3 (etc.) | 6 ÷ 12 (etc.) {as shown on p. 36} |
| 52 | Top | #14 accuracy of math language | If a/b has a remainder of 4, | If a has a remainder of 4 when divided by b, |
| 61 | Top | The Sum of Two Primes example, Choice [A] | b is an even number | ab is an even number |
| 62 | Middle | #6 | If x/y is even, | If x and y are integers and x/y is even, |
| 62 | Middle | #7 | If xyz is even, | x, y, and z are integers. If xyz is even, |
| 68 | Middle | #17 explanation for Quantity A neglects to divide by 4 before checking the tenths digit. | …by 4. The tenths digit will always have a zero in it (ie. 4.0, 8.0, 12.0). | …by 4, and the integer that results after dividing by 4 will always have a zero as the tenths digit (i.e. 4/4 = 1.0, 8/4 = 2.0, 12/4 = 3.0). |
| 95 | Top | #4 explanation | x can be 0 or 1. | x can be 0, -1, or 1. |
| 95 | Top | #4 explanation | If x = 1, our second equation… | If x = -1 or 1, our second equation… |
| 95 | Top | #4 explanation | …so x = 1. | …so x = 1 or -1. |
| 105 | Top | Factoring example: sqrt(360) | sqrt(2 × 2) × sqrt(3 × 3) –> sqrt(2 × 5) | sqrt(2 × 2) × sqrt(3 × 3) × sqrt(2 × 5) |
| 149 | Bottom | Set 1, Drill 6. 27 is not prime | Prime numbers: 2, 3, 5, 7, 17, 27, 29, 31 | Prime numbers: 2, 3, 5, 7, 17, 29, 31 |
| 149 | Bottom | Set 1, Drill 6. 27 is not prime | {omission between 21 and 33} | {insert} 27 (digits add to 9), |
| 149 | Bottom | Set 1, Drill 6. 27 is not prime | Again, all 5 numbers are divisibile by 3. | Again, all 6 numbers are divisibile by 3. |
| 170 | Middle | #9 solution assumes that x is an integer, but the question doesn’t specify. (If x could be a non-integer, the answer would be 204 instead of 256.) | …greater than 50, then what is the smallest possible value for x2? | …greater than 50 and x is a positive integer, then what is the smallest possible value for x2? |
| 177 | Middle | #6 | …splitting 81 + 169 into sqrt(81 + 169 is incorrect, | …splitting sqrt(81 + 169) into sqrt(81) + sqrt(169) is incorrect, |