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1. 1. Basic Math Counting and Addition By iTutor.com T- 1-855-694-8886 Email- info@iTutor.com
4. 4. AdditionAddition is .. ... bringing two or more numbers (or things) together to make a new total Here 1 ball is added to 1 ball to make 2 balls: "One plus one And in words it is: equals two" 3+2=5 © iTutor. 2000-2013. All Rights Reserved
6. 6. Addition of whole numbersSet ModelTo find “2 + 3”, one with 2 objects and the other with 3objects, form their union, and count the total. (click tosee animation) © iTutor. 2000-2013. All Rights Reserved
7. 7. Measurement ModelIn this model, the addition is performed on a number line.For example, to calculate 3 + 4,(1) draw an arrow with length 3 starting at 0.(2) draw an arrow with length 4 starting from the endof the previous arrow.(3) the sum is then the length of the two arrowscombined together this way.0 1 2 3 4 5 6 7 8 9 © iTutor. 2000-2013. All Rights Reserved
8. 8. Count From A Number Upwards Example: 6 + 3 Think "6 ... 7, 8, 9"Jump Strategy You can also count by 2s or 10s, or make any "jumps" you want to help you to solve a calculation. Example: 4 + 12 Think "4 ... 14, 15, 16" © iTutor. 2000-2013. All Rights Reserved
9. 9. Alternative number line model foradditionIn this model, a bunny is sitting above the number 0(which is its home base) facing right (which is the positivedirection), and will jump forward if it has to perform anaddition problem.0 1 2 3 4 5 6 7 © iTutor. 2000-2013. All Rights Reserved
10. 10. Example : 2 + 41. Our rabbit starts at 0 facing right.2. It then hops forward 2 units because it sees 2 in the beginning.0 1 2 3 4 5 6 7 © iTutor. 2000-2013. All Rights Reserved
11. 11. Example : 2 + 41. Our rabbit starts at 0 facing right.2. It then hops forward 2 units because it sees 2 in the beginning.0 1 2 3 4 5 6 7 © iTutor. 2000-2013. All Rights Reserved
12. 12. Example : 2 + 41. Our rabbit starts at 0 facing right.2. It then hops forward 2 units because it sees 2 in the beginning.0 1 2 3 4 5 6 7 © iTutor. 2000-2013. All Rights Reserved
13. 13. Example : 2 + 41. Our rabbit starts at 0 facing right.2. It then hops forward 2 units because it sees 2 in the beginning.3. After this the bunny has to jump 4 more steps forward because it sees +40 1 2 3 4 5 6 7 © iTutor. 2000-2013. All Rights Reserved
14. 14. Example : 2 + 41. Our rabbit starts at 0 facing right.2. It then hops forward 2 units because it sees 2 in the beginning.3. After this the bunny has to jump 4 more steps forward because it sees + 4.0 1 2 3 4 5 6 7 © iTutor. 2000-2013. All Rights Reserved
15. 15. Example : 2 + 41. Our rabbit starts at 0 facing right.2. It then hops forward 2 units because it sees 2 in the beginning.3. After this the bunny has to jump 4 more steps forward because it sees + 4. Since the bunny finally stops at 6, we know that 2 + 4 = 6.0 1 2 3 4 5 6 7 © iTutor. 2000-2013. All Rights Reserved