Lesson Notes By Weeks and Term v5 - Grade 4

Lesson Video

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Performance objectives

• Round off 4-digit numbers to the nearest 10, 100, and 1000.
• Estimate answers for addition and subtraction.
• Use the column method to add 4-digit numbers.
• Use the column method to subtract 4-digit numbers.
• Solve real-life word problems.

Lesson summary

This week, we build on our understanding of 4-digit numbers by learning powerful skills to work with them. We will focus on rounding numbers to make quick guesses (estimation) and then learn the proper way to add and subtract large numbers using the column method. These are not just classroom tricks; they are real-life maths superpowers! In South Africa, you use these skills every day. When your gogo sends you to the spaza shop with a R50 note, you estimate to see if you have enough money for bread, milk, and sugar. When your family plans a trip from Polokwane to Cape Town, you use subtraction to figure out how much further you have to drive.

Lesson notes

A. Rounding Off: Making Numbers Simpler Rounding helps us change a complicated number into a simpler one that's close to the original. It's great for estimating!

The Rule: Look at the digit to the right of the place value you are rounding to. If this digit is 4 or less (0, 1, 2, 3, 4), the digit you are rounding stays the same. We call this rounding down. If this digit is 5 or more (5, 6, 7, 8, 9), you add one to the digit you are rounding. We call this rounding up.