Kungfu math p4 slide14 (multiplication decimals)pdf

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Transcript of Kungfu math p4 slide14 (multiplication decimals)pdf

  • 1. Decimals MultiplicationWhat will we learn today? multiplication of decimals (up to 2 decimal places) by a 1-digit whole number
  • 2. In the previous lectures, we have learnt aboutaddition and subtraction in decimals. Lets recap!
  • 3. Applyingwhat we have learnt
  • 4. Try this out!Mr Li used 2.5kg of rice on Monday and 1.75 kgon Tuesday. He used a total of 9 kg Monday andWednesday. How much rice did he use onWednesday?
  • 5. SolutionMr Li used 2.5kg of rice on Monday and 1.75 kgmore on Tuesday. He used a total of 9 kg fromMonday to Wednesday.How much rice did he use on Wednesday? Step 1: 2.5kg + 1.75kg =___kg
  • 6. SolutionMr Li used 2.5kg of rice on Monday and 1.75 kgmore on Tuesday. He used a total of 9 kg fromMonday to Wednesday.How much rice did he use on Wednesday? 2.50 + 1.75 Step 1: 2.5kg + 1.75kg = 4.25kg He used 4.25kg of rice on Tuesday.
  • 7. SolutionMr Li used 2.5kg of rice on Monday and 1.75 kgmore on Tuesday. He used a total of 9 kg fromMonday to Wednesday.How much rice did he use on Wednesday? 2.50 + 4.25 Step 2: 2.5kg + 4.25kg = 6.75kgHe used 6.75kg of rice on Monday and Tuesday.
  • 8. SolutionMr Li used 2.5kg of rice on Monday and 1.75 kgmore on Tuesday. He used a total of 9 kg fromMonday to Wednesday.How much rice did he use on Wednesday? 9.00 - 6.75 Step 3: 9.00 kg - 6.75kg = 2.25 kg He used 2.25kg of rice on Wednesday.
  • 9. Multiplication in decimals
  • 10. Try this out!1. The length of ribbon A is 10.08 m. Ribbon B is 3 times as long as ribbon A. Find the length of ribbon B.
  • 11. Try this out!1. The length of ribbon A is 10.08 m. Ribbon B is 3 times as long as ribbon A. Find the length of ribbon B.Lets draw models to help us visualize the scenario.
  • 12. Try this out!1. The length of ribbon A is 10.08 m. Ribbon B is 3 times as long as ribbon A. Find the length of ribbon B. 10.08m A
  • 13. Try this out!1. The length of ribbon A is 10.08 m. Ribbon B is 3 times as long as ribbon A. Find the length of ribbon B. 10.08m A B
  • 14. Try this out!1. The length of ribbon A is 10.08 m. Ribbon B is 3 times as long as ribbon A. Find the length of ribbon B. 10.08m A B ?
  • 15. Try this out!1. The length of ribbon A is 10.08 m. Ribbon B is 3 times as long as ribbon A. Find the length of ribbon B. 10.08m 10.08 x 3 =_____m A B ?
  • 16. Do multiplication workings accordingly 10.08 x 3
  • 17. Do multiplication workings accordingly +2 10.08 x 3 4
  • 18. Do multiplication workings accordingly +2 10.08 x 3 24
  • 19. Do multiplication workings accordingly 10.08 x 3 .24Place the decimal place in a straight line.
  • 20. Do multiplication workings accordingly 10.08 x 3 0.24
  • 21. Do multiplication workings accordingly 10.08 x 3 30.24
  • 22. Try this out!1. The length of ribbon A is 10.08 m. Ribbon B is 3 times as long as ribbon A. Find the length of ribbon B. 10.08m 10.08 x 3 =30.24m A B 30.24m
  • 23. Are you ready to try out the questions?
  • 24. Visit kungfumath.sg today!