Let’s Learn!
What is rounding?
Goal:
Goal:
Think About It!
Goal: Round a number to the nearest 10.
Maria wants to know about how many carrots are at the store. We can help her by rounding 37 to the nearest 10! Rounding changes a number so that it is easier to use. When we round to the nearest 10, we change the number to the closest whole ten. Whole tens are numbers that end with 0. These are numbers like 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, or 100. Let’s try rounding 37!
Find 37 on the number line.
Put a dot on 37.
30 and 40 are benchmark numbers. They are the whole tens closest to 37.
Which whole 10 is closer to 37: 30 or 40?
40 is the closer whole 10! That means 37 rounded to the nearest 10 is 40.
How do we round numbers that are in the middle of two whole tens? Let’s try rounding 25 to the nearest 10.
When we round a number with 5 in the ones place, we always round up to the nearest ten. 25 rounded to the nearest 10 is 30.
Great job! If the digit in the ones place is 4 or less, we round down to the nearest 10. If the digit in the ones place is 5 or more, we round up to the nearest 10.
