Mathematics for Std III - Addition

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This presentation is meant for pupils of primary school of standard 3. It has been prepared by the classroom teacher, Mr Reshad Codabaccus of Bon Accueil Government School. He teaches using technology and wishes to share his works with all the pupils of Mauritius, Rodrigues and Agalega. Hope you will find it interesting the way the lesson has been presented. Any suggestions to improve the work, will be much appreciated. Email: eschool@intnet.mu. Thank you.

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Mathematics for Std III - Addition

  1. 1. Maths for Std III
  2. 2. How to add numbers
  3. 3. Addition using drawings 2 + 5 7
  4. 4. Addition using sticks 4 + 5 9
  5. 5. Addition using fingers 3 + 4 7
  6. 6. Counting with head and fingers 7 + 5 Put 7 in your head Then continue counting after 7 8 9 10 11 12 1 2 Show 5 fingers for number 5
  7. 7. Addition with carrying <ul><li>7 + </li></ul><ul><li>5 </li></ul>U T U 7 + 5 1 2 T
  8. 8. Addition with carrying <ul><li>7 + </li></ul><ul><li>5 </li></ul>U T Write the 2 in the unit column 2 1 2 U T
  9. 9. Addition with carrying <ul><li>7 + </li></ul><ul><li>5 </li></ul>1 2 U T U T Write the 2 in the unit column 2 1 6 Write the 1 in the tens column Add
  10. 10. Some worked examples
  11. 11. Example 1 <ul><li>Sam has 23 marbles . In a game he wins 14 more marbles . How many marbles does he have in all now? </li></ul><ul><li>Sam has  23 marbles </li></ul><ul><li>He wins  14 marbles </li></ul><ul><li>In all  marbles </li></ul>2 3 + 1 4 7 3 3 7 +
  12. 12. Example 2 <ul><li>Mother buys 12 m 25 cm of red ribbon and 15 m 65 cm of blue ribbon. Find the total length of ribbon which she buys. </li></ul><ul><li>Red ribbon  12 m 25 cm </li></ul><ul><li>Blue ribbon  15 m 65 cm </li></ul><ul><li>Total length  m cm </li></ul>1 2 2 5 + 1 5 6 5 m cm 10 0 1 90 27 9 7 2 +
  13. 13. Example 3 <ul><li>Raj takes 125 cL of juice and mixes it with 720 cL of water. Find the total capacity of the mixture he gets. </li></ul><ul><li>Juice  125 cL </li></ul><ul><li>Water  720 cL </li></ul><ul><li>Mixture  cL </li></ul>H T U 1 2 5 7 2 0 5 4 8 cL cL cL + + 845
  14. 14. Example 4 <ul><li>Jack buys 415 g of garlic and 350 g of ginger. What is the total mass of spices he buys? </li></ul><ul><li>Garlic  4 1 5 g + </li></ul><ul><li>Ginger  3 5 0 g </li></ul><ul><li>Total mass = </li></ul>U T H g 7 6 5
  15. 15. Example 5 <ul><li>Mala buys a pen for Rs 25 and a perfume for Rs 100 . How much does she pay for both articles? </li></ul><ul><li>Pen  Rs 2 5 + </li></ul><ul><li>Perfume  Rs 1 0 0 </li></ul><ul><li>Both  Rs </li></ul>H T U 1 2 5

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