- Paperback: 64 pages
- Publisher: Scholastic Teaching Resources (1 November 2001)
- Language: English
- ISBN-10: 0439256186
- ISBN-13: 978-0439256186
- Product Dimensions: 21.6 x 0.6 x 27.3 cm
- Average Customer Review: Be the first to review this item
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225 Fantastic Facts Math Word Problems: Amazing Facts and Quick Companion Word Problems That Build Skills in Multiplication, Division, Fractions, Decimals, Percentages, and More (Professional Books) Paperback – Import, 1 Nov 2001
About the Author
Eric Charlesworth is a New York-based writer and editor.
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Exhibit A: Question 43 seeks the number of decibels in the loudest whale pulse, which turns out to be 188 dB. The "hint" says the whale pulse is "2 times as loud" as a 94 dB stadium crowd, intending the child to multiply by two. But decibels are a logarithmic scale, meaning that the hint would lead someone with knowledge of decibels to an answer of 97 dB. This is not a subtle error -- it is a huge error. 188 decibels has 2.5 BILLION TIMES the strength of a 94 decibel sound, not "2 times" the strength.
Exhibit B: Question 215 wonders how hot the surface of Venus is, and asks students to add temperatures to get there. You don't and can't add temperatures (78 in San Diego, 62 in Wichita, 40 in Cleveland). It's not valid. Not that any student would, but if you converted to Celsius, added your answers, and converted back to Fahrenheit, you would get a completely different answer, because temperature isn't additive. For the record, neither can you multiply temperatures (except perhaps in Kelvin): what would it even mean to say a 64 degree day is "twice as warm" as a 32 degree day?
I know that I'm nitpicking. The interesting answers, which seem to all be correct, get students to do math. But much more care should have been put into the hints. If you understand science, these things will irk you; if not, hakuna matata, I suppose.