Rounding (Nearest 10 and 100)

Hundreds place: 600, tens place: 30, ones place: 4.

Students could draw a number line showing a tick mark for each number between 630 and 640 and label the tick mark for 634.

The hundreds place is the same in both numbers, so I need to compare the tens place. There are 0 tens in 207 and there are 5 tens in 250. 5 tens is greater than 0 tens, so 250 is greater than 207.

The digits in the hundreds place in each number are different, so I can compare the digits in the hundreds place. 9 is in the hundreds place in 948. 8 is in the hundreds place in 899. 9 is greater than 8, so 948 is greater than 899.

Jaffar is not correct. The way to compare numbers is to start with the greatest place first and compare the digits in that place. If the digits are the same, move on to the next digit to the right. In this case, the digit 2 is in the hundreds place in 200. There is no digit in the hundreds place in 99. This is the same as having 0 in the hundreds place. So we can compare the digits in the hundreds place. 2 is greater than 0, so 200 is greater than 99.

Draw a number line from 370 to 380. Put a tick mark in the middle and label it 375. 378 is greater than 375, so plot the point for 378 between 375 and 380. 378 is closer to 380 than 370, so 378 rounds up to 380.

Look to the right of the place you want to round to. If the digit in that place is 5 or greater, round up. If the digit in that place is less than 5, round down.

First I look at the tens place, which has the digit 4. The place to the right of that place is the ones place, and it has a 5. When I have a 5 in the place to the right, I round up, so 645 rounded to the nearest ten is 650.

849.

257.