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1、1. There is a number which only has 1 digit, if you add the number 2 in front of it, then the new 2 digit number is 6 times the original number. What is the original number?2. Lee is reading a comic book which has 127 pages. He wants to know how many numbers it used to print all these page numbers f
2、rom page 1 to page 127. To count them is not good idea because its a waste of time, would you help him to find it out with an easier way?3. If these letters A,B,C,D represent numbers, A1370，so =?4. There is a 6 digit number, the units digit is 2, if you put the units digit in front of this number, t
3、he original number is 3 times the new number. What is the original number?5. If you put 0 after a 2 digit number, the new number is 243 more than the original number. What is the original number?6. If you put 3 in front of a 2 digit number, the new 3 digit number is 7 times and 24 plus the original
4、number. What is the original number?7. If you put 5 in front of a 2 digit number, the new number is 8 times and 18 less than the original number. What is the original number?8. If 11 = A+B+C ，what is ？9. 19.9-19.8+19.7-19.6+19.5-19.4+.+0.3-0.2+0.1=?10. There is a 4 digit number, if you put a decimal
5、 point in it and then take away the original number, the answer is 2059.2，what is the original number？11. There is a circulating decimal 0.987654321, what is the 200th number after the decimal point? What is the digital sum from the 1st number to the 200th number after the decimal point?12. There ar
6、e two boards at the classroom. Board A is 1/3 the length of board B. Board As length times 6 and subtract by 10 equals to board Bs length decreased by 11 inches. What is the length of board B?13. Jack has a problem solving these problems would you be able to help him? Remember place value! 3.1441+3.
7、14101+15.73.14+3.1420283.14514. If there is a three digit number, than you repeat it , so it will be a six digit number, if you use the six digit number divided by 13 and then 11 , and then 7, what will you get?15. If those letters A, B,C,D,E, represent numbers, ABCDE+ABCD+ABC+AB+A=48411,what is A,B,C,D,E?16. If you put a 2 in front of a 3 digit number, the new number will be 12 times bigger and 124 less than the original number. What is the original number?