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Abacus

Abacus . Lesson 2. Big Friends & Little Friends. Breakdowns of 10 are called Big Friends. Breakdowns of 5 are called Little Friends. Big friends. Big Friends Chant. 1  9 2  8 3  7 4  6 5  5 6  4 7  3 8  2 9  1. Big Friends Rap. Add & subtract using big friends.

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Abacus

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  1. Abacus Lesson 2

  2. Big Friends & Little Friends Breakdowns of 10 are called Big Friends Breakdowns of 5 are called Little Friends

  3. Big friends Big Friends Chant • 1  9 • 2  8 • 3  7 • 4  6 • 5  5 • 6  4 • 7  3 • 8  2 • 9  1 Big Friends Rap

  4. Add & subtract using big friends Addition Subtraction -9= +1-10 -8= +2-10 -7= +3-10 -6= +4-10 -5= +5-10 -4= +6-10 -3= +7-10 -2= +8-10 -1= +9-10 • +9= -1+10 • +8= -2+10 • +7= -3+10 • +6= -4+10 • +5= -5+10 • +4= -6+10 • +3= -7+10 • +2= -8+10 • +1= -9+10

  5. Little Friends Little Friends Chant • 1  4 • 2  3 • 3  2 • 4  1 Little Friends Rap

  6. Add & subtract using little friends Addition Subtraction -4= +1-5 -3= +2-5 -2= +3-5 -1= +4-5 • +4= -1+5 • +3= -2+5 • +2= -3+5 • +1= -4+5

  7. Teach them as a rap • You may make up a song, but that means teacher and students all need to be able to sing. • You may teach it as a rap, and add movements. • Then you also teach a mnemonic, in case they forget it: • Use both hands, fold the number of fingers to add. The remaining fingers are the number to subtract. Big Friend of 1 is 9

  8. Thank you! Practice, practice, practice!

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