Place value - Rounding to the nearest 10 - Presentation

The concept of rounding numbers to the nearest 10 is an essential skill in place value, and a series of activities have been designed to help students master this mathematical concept. Starting with Activity 1, students are tasked with identifying which numbers are multiples of 10, using examples such as 56, 60, 22, 40, 100, 79, 100, 20, 45, 95, 150, and 200. This activity lays the foundation for understanding the significance of multiples of 10 in the rounding process. In subsequent activities, students delve deeper into place value by determining which multiples of 10 specific numbers fall between. For example, they examine sequences of numbers like 41 to 49 and 91 to 99, and identify the multiples of 10 that these numbers are closest to.

Further along, in Activity 3, students engage with a number line to decide whether certain numbers are closer to 140 or 150, rounding numbers like 143, 146, and 148 to the nearest 10. This exercise is designed to refine their understanding of proximity on the number line. Activity 4 challenges students to consider what happens when a number falls exactly in the middle, such as 45, and they practice rounding it to the nearest multiple of 10. The activity also includes rounding numbers like 25, 95, and 135 to the nearest 10. Finally, in Activity 5, students complete a table by rounding numbers like 321 and XCVIII to the nearest 10, solidifying their grasp of the concept with practical examples and helping them to visualize the rounding process.