1 / 24

Multiplying Numbers and Decimals.

Multiplying Numbers and Decimals. Level 6/7 Grade D/C. Level 5 Grade E. Level 4 Grade F. Level 3 Grade G. On Your Mini Whiteboards…. 37 x 424 9 x 1.6 2.1 x 0.36. Learning Objectives (Today). To be able to use the grid method to multiply large numbers

kaya
Download Presentation

Multiplying Numbers and Decimals.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Multiplying Numbers and Decimals. Level 6/7 Grade D/C Level 5 Grade E Level 4 Grade F Level 3 Grade G

  2. On Your Mini Whiteboards… • 37 x 424 • 9 x 1.6 • 2.1 x 0.36

  3. Learning Objectives (Today) • To be able to use the grid method to multiply large numbers • To use this knowledge in answering multiplication questions with decimals. • To solve problems in Real Life contexts.

  4. Multiplying Numbers……. • If the number 3561 is made up of; 3000 + 500 + 60 + 1 • And the number 4020 is made up of; 4000 + 20 • What are the following numbers made up of? • 2568 • 2020 • 5003 • 320 • 424 2000 + 500 + 60 + 8 2000 + 20 5000 + 3 300 + 20 400 + 20 + 4

  5. Quick Methods…. • To calculate 20 x 30 I can use a quick method… a) Calculate the sum without the 0’s 2 x 3 = 6 b) Add the 0’s back in to the calculation There were two zero’s in my original calculation so my answer would be 6 + 00, or 600. Try these… 20 x 40 20 x 50 200 x 300 500 x 7000 2000 x 90 x 200 800 1,000 60,000 3,500,000 36,000,000

  6. Multiplying using the grid method. • 22 x 37….. 20 2 600 + 140 + 60 + 14 = 814 30 7 600 60 140 14

  7. The Grid Method…. • 461 x 22….. 400 60 1 8000 + 1200 + 20 + 800 + 120 + 2 = 10142 20 2 8000 1200 20 120 2 800

  8. Standard Harder

  9. On Your Mini Whiteboards… • 37 x 424 • 9 x 1.6 • 2.1 x 0.36

  10. Plan for Number Scheme of Work….. Level 6/7 Grade D/C Level 5 Grade E Level 4 Grade F Level 3 Grade G

  11. Learning Objectives (Today) • To be able to use the grid method to multiply large numbers • To use this knowledge in answering multiplication questions with decimals. • To solve problems in Real Life contexts.

  12. Double decimal trouble! Count the decimal places! 25 84 . . 2 3 4 x 7 6 = REMEMBER Old answer was… . 8 5 2 4 . 25 84 2

  13. Decimal dilemma! Where would the decimal point go in these answers? . 4 7 x36 = 169 2 . . 25 20 56 x 0 45 = . . = 6 23 x 7 4 46 102 . . 153 0 51 = 0 03 x

  14. Decimal dilemma! Where would the decimal point go in these answers? . . 4 7 x 36 = 169 2 . . 20 25 56 x 0 45 = . . . = 6 23 x 7 4 46 102 . . . 153 0 0 51 = 0 03 x 0 0.0153

  15. Re-Cap….. • Do the calculation as normal without the decimal points. • Count how many times the numbers (or decimal point if it helps) have moved. • Move the same number in your answer.

  16. Words! Words! Work out the answer to each question. You MUST show your working out! 1 2 A box of sweets costs £5.45. Ben buys 32 boxes for his shop. How much did he pay? 26 people each buy a ticket to see a show. Each ticket cost £7.60. How much did they pay altogether? £174.40 £197.60 John wants to book a meal for him and 38 other friends to celebrate his 30th birthday. Each meal costs £17.79. John has saved £700. 3 Catherine wants to book a hotel room for her holiday. She wants to book for 17 nights. The room costs £37.86 per night. 4 a) How much will the room cost? a) How much will the meal cost John? £643.62 £693.81 b) She counts her money and finds she has £587.79. How much extra does she need? b) Has John saved enough money, and if so, by how much? £55.83 Yes by £6.19

  17. On Your Mini Whiteboards… • 37 x 424 • 9 x 1.6 • 2.1 x 0.36

  18. Plan for Number Scheme of Work….. Level 6/7 Grade D/C Level 5 Grade E Level 4 Grade F Level 3 Grade G

  19. Learning Objectives (Today) • To be able to use the grid method to multiply large numbers • To use this knowledge in answering multiplication questions with decimals. • To solve problems in Real Life contexts.

  20. Reflection on Today’s lesson…. • Give yourself a colour for Work ethic and a number for Understanding

  21. Today I have enjoyed…

More Related