Mathematics - Term 3 - Week 7

Number sense refers to the ability to understand, relate, and connect numbers. It involves recognizing numbers, understanding their magnitude, and being able to manipulate them in various ways. In this lesson, we will explore how to compare numbers, estimate quantities, and perform basic operations. We will also discuss the importance of number sense in everyday life, such as budgeting, measuring, and making decisions.

Let's compare the numbers 47 and 58. To determine which is greater, we can use a number line. On the number line, 47 is to the left of 58, indicating that 58 is greater than 47. We can also subtract: 58 - 47 = 11, which confirms that 58 is larger. This method can be applied to any two numbers to compare their sizes.

Now, let's practice counting by tens. Start from 0 and count up to 100 by tens: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100. After counting, let's discuss how this method helps us quickly identify larger numbers and make estimations. For instance, if we need to estimate the total of 57 and 34, we can round them to 60 and 30, respectively, making it easier to calculate that the total is approximately 90.

Complete the following problems independently: 1) What is the sum of 45 and 67? 2) Compare 82 and 75 using a number line. 3) Estimate the total of 23, 45, and 32 by rounding. Show your working for each problem. After completing, review your answers with a partner and discuss any mistakes.

• 34
• 29
• 42
• 56

Answer: 56

56 is greater than all the other numbers listed.

• 42
• 32
• 40
• 38

Answer: 42

15 plus 27 equals 42.

Answer: 85

Rounding 48 to 50 and 37 to 40 gives an estimated sum of 90.

• 55
• 60
• 45
• 70

Answer: 45

45 is less than 50.

Answer: 33

100 minus 67 equals 33.

• 50
• 45
• 40
• 55

Answer: 50

Counting by fives: 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50.

Answer: 69

23 plus 34 plus 12 equals 69.

• 21
• 33
• 44
• 55

Answer: 44

44 is an even number, while the others are odd.