Rounding Whole Numbers
Objective: The fifth grade student will, given a whole number, round that whole number, to either the nearest tens, hundreds, or thousands.
Objective: The fifth grade student will, given a whole number that is rounded to the nearest tens, hundreds, or thousands, select from a list of four numbers that number which would round to the given number.
Rounding numbers has many important purposes. One is in science where significant digits is important. Another is that rounding allows for calculations that can be done in your head. For example, many people when shopping will keep track in their head the amount they have spent at the grocery store by rounding the items that they are purchasing to the nearest dollar.
A number is rounded to the nearest tens by looking at the last digit of the number.
If the last digit is 0, 1, 2, 3, or 4, then the number is rounded to 0. Examples: 183 rounds to 180; 544 rounds to 540; and 3651 rounds to 3650.
If the last digit is 5, 6, 7, 8, or 9, then add one to the second to the last digit and set the last digit to 0. Examples: The number 189 rounds to 190; 736 rounds to 740; and 596 rounds to 600.
A number is rounded to the nearest hundreds by looking at the last two digits of the number.
If the last two digits are 00, 01, 02, ..., 49 change the last two digits to 00. Examples: 642 rounds to 600; 4124 rounds to 4100; and 9227 rounds to 9200. (Note also that 13 rounds to 0, the same as any other number < 50.)
If the last two digits are 50, 51, 52, ..., 99, add 1 to the third to the last digit and change the last two digits to 00. Examples: 658 rounds to 700; 2199 rounds to 2200; and 13981 rounds to 14000.
A number is rounded to the nearest thousands by looking at the last three digits of the number.
If the last three digits are 000, 001, 002, ..., 499 change the last three digits to 000. Examples: 4229 rounds to 4000; 26413 rounds to 26000; and 435 rounds to 0 (Any number < 500 will round to 0).
If the last three digits are 500, 501, 502, ..., 999 add 1 to the fourth to the last digit and change the last three digits to 000. Examples: 5843 rounds to 6000; 154,789 rounds to 155,000; and 500 rounds to 1000.
THE PROGRAM
Examine the question and select an answer: Read the problem. Select an answer as either A, B, C, or D.
Check the answer: Click on the Check button to check the answer.
New Problem: Click on the New Problem button to start another problem.
Delay: The soccer players move according to your computer processor speed. If the player moves too fast make the number larger and click on Delay. If too slow, enter a smaller number and click on Delay.