Welcome! Today we'll learn about rounding to whole numbers. Rounding means finding the closest integer to a decimal number. We use the number line to visualize this process. For example, 4.3 is closer to 4, while 4.7 is closer to 5.
The rounding rules are simple to remember. If the tenths digit is 0, 1, 2, 3, or 4, we round down to the lower whole number. If the tenths digit is 5, 6, 7, 8, or 9, we round up to the higher whole number. Let's see some examples: 3.2 rounds down to 3, 7.8 rounds up to 8, and 5.5 rounds up to 6.
Now let's practice with more examples. We'll use the number line to see where each number falls and determine the nearest whole number. Watch as we demonstrate each example: 2.1 rounds to 2, 6.9 rounds to 7, 8.5 rounds to 9, and 1.4 rounds to 1. Remember to look at the tenths digit to decide!
The rounding rules are simple to remember. If the tenths digit is 0, 1, 2, 3, or 4, we round down to the lower whole number. If the tenths digit is 5, 6, 7, 8, or 9, we round up to the higher whole number. Let's see some examples: 3.2 rounds down to 3, 7.8 rounds up to 8, and 5.5 rounds up to 6.
Now let's practice with more examples. We'll use the number line to see where each number falls and determine the nearest whole number. Watch as we demonstrate each example: 2.1 rounds to 2, 6.9 rounds to 7, 8.5 rounds to 9, and 1.4 rounds to 1. Remember to look at the tenths digit to decide!
Let's break down the rounding process into clear steps. First, identify the tenths place digit. Second, apply the rounding rule: if the digit is 0 through 4, round down; if it's 5 through 9, round up. Third, remove all decimal places to get your final whole number. For example, with 9.3, the tenths digit is 3, which is less than 5, so we round down to 9.