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Objectives Day 1 Revise finding unit fractions of quantities using division facts. Day 2

Learn to find fractions of quantities by understanding unit fractions, division facts, and multiplication in this comprehensive Year 3 math lesson.

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Objectives Day 1 Revise finding unit fractions of quantities using division facts. Day 2

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  1. Fractions Use understanding of fractions to find fractions of amounts Objectives Day 1 Revise finding unit fractions of quantities using division facts. Day 2 Revise finding non-unit fractions of quantities using division and multiplication. Year 3

  2. Fractions Use understanding of fractions to find fractions of amounts Starters Day 1 Division facts for 5 times table (pre-requisite skills) Day 2 Division facts for 3 times table (pre-requisite skills) Year 3

  3. Fractions Use understanding of fractions to find fractions of amounts Starter Division facts for 5 times table Year 3

  4. Fractions Use understanding of fractions to find fractions of amounts Starter Division facts for 3 times table Year 3

  5. Fractions Use understanding of fractions to find fractions of amounts Objectives Day 1 Revise finding unit fractions of quantities using division facts. Year 3

  6. Day 1: Revise finding unit fractions of quantities using division facts. Take 12 cubes with your partner and use them to find half of 12. What is 1/2 of 12? How do you know? 12 ÷ 2 = 6 Year 3

  7. Day 1: Revise finding unit fractions of quantities using division facts. How could you find 1/3 of 12? Or 1/4 ? Or 1/6? Or 1/12? What division facts do they link to? Let’s check… 1/3 of 12 = 4; 12 ÷ 3 = 4 1/4 of 12 = 3; 12 ÷ 4 = 3 1/6 of 12 = 2; 12 ÷ 6 = 2 Now try to find 1/5 of 12? What happens? Check with the cubes. 1/12 of 12 = 1; 12 ÷ 12 = 1 Year 3

  8. Day 1: Revise finding unit fractions of quantities using division facts. Let’s check… Now try with 16 cubes. What is 1/2 of 16? What other fractions of 16 can you find? Which divisions leave a remainder? 1/2 of 16 = 4; 16 ÷ 2 = 8 1/4 of 16 = 4; 16 ÷ 4 = 4 1/8 of 16 = 2; 16 ÷ 8 = 2 Who got all those? Dividing 16 by 3, 5, 6, 7, 9 or 10 all left a remainder! 1/16 of 16 = 1; 16 ÷ 16 = 1 Year 3

  9. Challenge Year 3

  10. Fractions Use understanding of fractions to find fractions of amounts Objectives Day 2 Revise finding non-unit fractions of quantities using division and multiplication. Year 3

  11. Day 2: Revise finding non-unit fractions of quantities using division and multiplication. We can use a bar model to help us find fractional amounts. What is 1/5 of 25? There are 5 smaller boxes, how many should go in each? What is 25 ÷ 5? So what is 2/5 of 25? 3/5 of 25? 4/5 of 25? Once we know 1/5we can use times tables facts to find the others! Year 3

  12. Day 2: Revise finding non-unit fractions of quantities using division and multiplication. Let’s check… On your whiteboards draw a bar model to represent 24 ÷ 6. 6 sections. How many smaller sections? What number goes in each? 4 in each. What is 1/6 of 24? We could count on in 4s: 4, 8, 12… but it is quicker to multiply 4 by 5! So what is 5/6 of 24? Year 3

  13. Day 2: Revise finding non-unit fractions of quantities using division and multiplication. Let’s check… Now on your whiteboards draw a bar model to represent 24 ÷ 8. 8 sections. How many smaller sections? What number goes in each? 3 in each, since 24 ÷ 8 = 3 1/8 of 24 = 3 Use this to find 3/8 of 24, 5/8 of 24, 2/8 of 24 and 6/8 of 24, in each case by multiplying 3 by the numerator of the fraction. Year 3

  14. Day 2: Revise finding non-unit fractions of quantities using division and multiplication. Now try 3/4 of 20 and 2/3 of 15. Can you find these without drawing the bar model? What calculations will you do? …then multiplying by the numerator (top number of the fraction). Try dividing the number by the denominator (bottom) of the fraction… 1/3 of 15 = 5, so 2/3 = 10. Can you see why? 1/4 of 20 = 5, so 3/4 = 15. Can you see why? Year 3

  15. Challenge Year 3

  16. Fractions Use understanding of fractions to find fractions of amounts Well Done! You’ve completed this unit. Objectives Day 1 Revise finding unit fractions of quantities using division facts. Day 2 Revise finding non-unit fractions of quantities using division and multiplication. Year 3

  17. Problem solving and reasoning questions True or false? • A piece of paper folded equally in 3, then folded in half is divided into sixths when you open it out. • 1/3 of a piece of paper is larger than 2/6 of the same piece. • Two eighths make a quarter. • 2/5 of 5 is 2. • 3/8 of 16 is 5. Draw a bar model to represent each question: 3/8 of 32? 4/5 of 40? 5/6 of 42? Write the answers. Write < or > or = between these fractions of amounts: 3/5 of 40 2/3 of 30 Year 3

  18. Problem solving and reasoning: Answers True or false? • A piece of paper folded equally in 3, then folded in half is divided into sixths when you open it out. True. • 1/3 of a piece of paper is larger than 2/6 of the same piece. False, they are the same since 1/3 and 2/6 are equivalent fractions. • Two eighths make a quarter. True. • 2/5 of 5 is 2. True. • 3/8 of 16 is 5. False it is 6. Draw a bar model to represent each question: 3/8 of 32? 12 4/5 of 40? 32 5/6 of 42? 35 Write the answers. Write < or > or = between these fractions of amounts: 3/5 of 40 >2/3 of 30 3/5 of 40 = 24 and 2/3 of 30 = 20, so 3/5 of 40 is the greater. Year 3

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