Round Numbers to the nearest 100 micro-lesson
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In this lesson, we will round large numbers to the nearest hundred. So, when rounding to the nearest hundred, we're trying to find what hundred the number is nearest to. First, we need to identify the hundreds column. It can be useful to circle this. A hundred is any number that has nothing in the tens or units’ columns so we put zeros in these columns, the ones to the right of the hundred’s column. We then need to look in the ten’s column. If there's a four or less, then the digit stays the same, the one that's in the hundred’s column. If there's a five or more, the digit in the hundred’s column goes up by one. Drawing this on a number line can help us. Let's try with 62,647. As in this case, there's a four in the ten’s column. The hundred, which is a six at this point stays the same. And remember, we put zeros in the tens and one’s columns.
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If a number is a 'hundred' what digits will you find in the tens and units columns?1) 02) 13) 94) 5
Round 242,390 to the nearest 100.1) 2424002) 2425003) 2423004) 242350
Round 627,250 to the nearest 100.1) 6273002) 6272003) 6271004) 627400
Round 672,314 to the nearest 100.1) 6723002) 6722003) 6724004) 672500
Round 723,821 to the nearest 100.1) 7238002) 7237003) 7240004) 723000
Round 5,823,782 to the nearest 100.1) 58238002) 58237003) 58239004) 5824000
When rounding to the nearest 100, we round the number up, when what digits are in the tens column?1) 5, 6, 7, 8 or 92) 1, 2, 3 or 43) 1, 2, 3, 4 or 54) 6, 7, 8, or 9
When rounding to the nearest 100, we round down (the digit in the hundreds column stays the same) when what digits are in the tens column?1) 1, 2, 3 or 42) 1, 2, 3, 4 or 53) 5, 6, 7, 8 or 94) 6, 7, 8, or 9
The two columns to the right of the hundreds column are...1) the tens and units columns.2) the thousands and ten thousands columns.3) the tens and thousands columns.4) there aren't any columns to the right of the hundreds column.
When rounding to the nearest 100, we are always trying to find...1) what hundred the number is nearest to.2) what thousand the number is nearest to.3) if there is a hundred near the number.4) what hundred is before the number.
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