3-Digit Number Sense( Week 24 Practice) 1. Round 738 to the nearest hundred's place. 2. By turning a page upside down, some page numbers still show the exact same numbers. Examples of such page numbers are 1, 69, 808,.... How many such numbers from 1 to 616? 3. 143 is a 3-digit number with the sum of the ones digit and the hundreds digit equal to the tens digit, i.e 1 + 3 = 4. How many such 3-digit number(s) are there between 450 and 469 inclusively? 4. 431 is a 3-digit number with digits in descending order from left to right, i.e 3 < 4 and 1 < 3. There are 10 3-digit number(s) between 500 and 580 inclusively with digits in descending order. What are these 10 numbers? 5. 307 and 703 are a pair of 3-digit numbers with digits reversed on each other. Their difference is 703 − 307 = 396. How many pairs of such 3-digit numbers (with the difference of 396) are there? |