ffirs.indd
Tests for Divisibility 213 Divisibility by 9: If the digit sum adds up to 9 or is evenly divisible by 9, the number is divisible ...
bbapp04.indd 214app 04 .indd 214 1 1/5/07 11:36:17 AM/ 5 / 07 11 : 36 : 17 AM ...
215 = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < ...
216 Appendix E 1 2 3 4 5 At the time I was using the wrong sequence, but Jack Zhang kindly showed me the correct sequence for th ...
217 = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < ...
218 Appendix F Now, what if someone took away those three bills for $2? Th at is minus 3 bills or amounts of minus $2. Th at mea ...
219 = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < ...
220 Appendix G If you read that 23% of people have blond hair, it means that 23 people out of every 100 have blond hair. You cou ...
Percentages 221 So, summarized, to calculate the percentage of 17 to 58, for example, you would divide 17 by 58 and multiply the ...
bbapp07.indd 222app 07 .indd 222 1 1/9/07 8:43:03 AM/ 9 / 07 8 : 43 : 03 AM ...
223 = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < ...
224 Appendix H doesn’t suit the way you think or make sense to you, you are inclined to think it is “all above my head.” I am no ...
225 = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < ...
226 Appendix I I actually have to pay a bit less than $24,000. Of course, when it comes time to pay, I want to pay exactly what ...
227 = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < ...
228 Appendix J Why does it work? Try using 70 as a reference number and you will see we are dealing with something we already kn ...
Squaring Numbers Ending in 5 229 Test you rself Now try these for yourself. Don’t write anything—do them all in your head. a) 35 ...
bbapp10.indd 230app 10 .indd 230 1 1/5/07 11:39:00 AM/ 5 / 07 11 : 39 : 00 AM ...
= x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < > + - = x 0 1 2 3 4 5 6 7 8 9 ( ) % < &g ...
232 bbapp11.indd 232app 11 .indd 232 1 1/5/07 11:39:11 AM/ 5 / 07 11 : 39 : 11 AM ...
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