Rounding - nearest ten or hundred only

Learning Objectives Identify the tens and hundreds place in a 3-digit number. Determine which two tens or hundreds a number is between. Apply the '5 or more' rule to round up. Apply the '4 or less' rule to round down. Round any 2-digit number to the nearest ten. Round any 3-digit number to the nearest ten or hundred. Imagine a jar has 78 jellybeans. Isn't it easier to tell your friend there are 'about 80' jellybeans? 🍬 That's rounding! Today, we will learn how to round numbers to the nearest ten and nearest hundred. Rounding helps us turn tricky numbers into simpler, 'friendly' numbers that are easier to count, measure, and talk about. It's a super skill for making quick guesses, or estimates. Real-World Applications...

TermDefinitionExample RoundingChanging a number to a simpler, 'friendly' number that is close to the original number. It makes numbers easier to work with.The number 27 is close to 30, so we can round 27 to 30. DigitAny of the numerals from 0 to 9.The number 183 has three digits: 1, 8, and 3. Place ValueThe value of a digit based on its position in a number.In the number 462, the 4 is in the hundreds place, the 6 is in the tens place, and the 2 is in the ones place. Nearest TenThe multiple of 10 (like 10, 20, 30...) that a number is closest to.The number 43 is closest to the 'ten' of 40. Nearest HundredThe multiple of 100 (like 100, 200, 300...) that a number is closest to.The number 681 is closest to the 'hundred' of 700. EstimateA close guess or an 'ab...

The Rounding Rule Look at the digit to the right of your target place. If the digit is \ge 5, round up. If the digit is < 5, round down. This is the main rule for all rounding. The numbers 0, 1, 2, 3, and 4 tell you to round down (keep the target digit the same). The numbers 5, 6, 7, 8, and 9 tell you to round up (add one to the target digit). Rounding to the Nearest Ten For a number with tens digit T and ones digit O: If O \ge 5, round to (T+1)0. If O < 5, round to T0. To round to the nearest ten, you must look at the digit in the ones place. For example, for 63, the ones digit is 3 (< 5), so we round down to 60. For 68, the ones digit is 8 (\ge 5), so we round up to 70. Rounding to the Nearest Hundred For a number with hundreds digit H and tens digit T: If T...