In this Grade 6 Saxon Math lesson (Course 1, Chapter 2, Lesson 16), students learn how to round whole numbers to the nearest ten, hundred, and thousand using number line visualization, including the rule for rounding up when a number falls exactly halfway between two values. The lesson also introduces estimation as a practical skill, showing students how to round numbers before performing addition, subtraction, multiplication, or division to quickly approximate answers and judge reasonableness. Real-world examples, such as estimating whether a shopper has enough money or reading a population bar graph, help students apply rounding and estimation in everyday contexts.
Section 1
📘 Rounding Whole NumbersEstimating
When we round a whole number, we are finding another whole number, usually ending in zero, that is close to the number we are rounding.
This card introduces the core idea of approximation. Soon, you'll work through examples on rounding to different place values and applying estimation to solve practical problems.
Section 2
Rounding whole numbers
When we round a whole number, we are finding another whole number, usually ending in zero, that is close to the number we are rounding.
Think of rounding as finding a number's closest 'cool friend' that ends in a zero. For 667, the number line shows 670 is a much closer buddy than 660. If a number like 550 is exactly in the middle, it gets a boost and always rounds up to the bigger, cooler number, 600!
Section 3
Estimating
Estimating is a quick way to 'get close' to the answer. To estimate, we round the numbers before we add, subtract, multiply, or divide.
Estimating is your math superpower for getting 'close enough' answers super fast! Instead of dealing with tricky numbers like 467 + 312, just round them to their friendly neighbors first. In this case, 500 and 300. Adding those is a piece of cake! It's perfect for quickly checking if your exact answer is reasonable.
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Section 1
📘 Rounding Whole NumbersEstimating
When we round a whole number, we are finding another whole number, usually ending in zero, that is close to the number we are rounding.
This card introduces the core idea of approximation. Soon, you'll work through examples on rounding to different place values and applying estimation to solve practical problems.
Section 2
Rounding whole numbers
When we round a whole number, we are finding another whole number, usually ending in zero, that is close to the number we are rounding.
Think of rounding as finding a number's closest 'cool friend' that ends in a zero. For 667, the number line shows 670 is a much closer buddy than 660. If a number like 550 is exactly in the middle, it gets a boost and always rounds up to the bigger, cooler number, 600!
Section 3
Estimating
Estimating is a quick way to 'get close' to the answer. To estimate, we round the numbers before we add, subtract, multiply, or divide.
Estimating is your math superpower for getting 'close enough' answers super fast! Instead of dealing with tricky numbers like 467 + 312, just round them to their friendly neighbors first. In this case, 500 and 300. Adding those is a piece of cake! It's perfect for quickly checking if your exact answer is reasonable.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter