What are ten numbers that can be formed between 700-800 from a number, plus it's reverse?
1. 502 + 205 = 707
2. 641 + 146 = 787
3. 611 + 116 = 727
4. 433 + 334 = 767
5. 512 + 215 = 727
6. 621 + 126 = 747
7. 413 + 314 = 727
8. 532 + 235 = 767
9. 601 + 106 = 707
10. 423 + 324 = 747
Explanation:
I first look at the numbers last digit. I see if there are two numbers I can add to make that number. If those two numbers will also add to make the first digit, as the number will be flipped, it will work. I can then use two numbers that will make the second digit. If the number is odd, I will have to make the number add over ten and it will carry one to the next column. If I have to do that, the first numbers will have to change. The first numbers will be one less and be over ten. For example to make the number over ten if the number is 16, I will need two numbers that make that so the digit will be left with 6 when 10 is carried over.