Lesson Notes By Weeks and Term v5 - Grade 3

Lesson Video

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Performance objectives

• Compare numbers using <, >, and =
• Order numbers from smallest to biggest and biggest to smallest
• Round numbers to the nearest 10
• Double and halve numbers

Lesson summary

Overview This week, we continue our journey into the exciting world of numbers up to

9

9

9. We will move beyond simply identifying numbers and start to work with them in powerful ways. We will learn how to compare numbers to see which is bigger or smaller, just like comparing prices at the spaza shop to get the best deal. We will learn how to put numbers in order, which is useful for everything from finding a house number on a street to understanding sports scores.

Lesson notes

Concept 1: Comparing Numbers ( , =)

What it is: Comparing numbers means looking at two or more numbers to see which one has a greater value, a lesser value, or if they are equal.

Why it matters: We compare numbers all the time! Is R250 more than R215 for a new soccer ball? Did the Blue Bulls score more points than the Stormers?

How to do it: We use special symbols: > means 'greater than' (bigger than) ** and , 229 Question 2: Rounding A bus trip from Durban to Pietermaritzburg is 87 km. Round this distance to the nearest 10 km.

Solution: We need to round the number

8

7. Look at the Units digit: The units digit is

7. Apply the rule: The rule says if the digit is 5 or more, we round up.

Round up: The Tens digit (8) goes up by one to become

9. The units digit becomes

0. Answer: 87 rounded to the nearest 10 is

9

0. The trip is about 90 km.

Question 3: Doubling Mama is baking koeksisters. The recipe needs 125g of flour. She wants to make a double batch for the whole family. How much flour does she need?

Solution: We need to double

1

2

5. Break down the number: 125 = 100 + 20 +

5. Double each part: Double 100 is

2

0

0. Double 20 is

4

0. Double 5 is

1

0. Add the parts together: 200 + 40 + 10 =

2

5

0. Answer: Mama needs 250g of flour. Independent Practice (Questions Only)

Fill in the correct symbol: > , < or =. a) 451 ___ 415 b) 98 ___ 101 c) 670 ___ 607 d) 399 ___ 400 Arrange these numbers in descending order (biggest to smallest): 345, 534, 354, 543, 453 Arrange these numbers in ascending order (smallest to biggest): 909, 99, 990, 199, 919 Round these numbers to the nearest 10: a) 56 b) 92 c) 145 d) 298 What is double 75? What is half of 90? What is double 132? What is half of 152? The Springboks scored 49 points. Round their score to the nearest

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0. There are 245 learners in Grade 3 at Sunshine Primary School. The school wants to double the number of learners in Grade 3 next year. How many learners will there be?