19 - 1=, EIGHTEEN, NINE, TEN, NINETEEN, 17 - 5 =, SIXTEEN, TWELVE, FOUR, SIX, 15 -12 =, THIRTEEN, FIFTEEN, THREE, FIVE, 19 - 5 =, FIFTEEN, SEVENTEEN, NINE, FOURTEEN, 14 - 13 =, ONE, THREE, SIXTEEN, ELEVEN, 18 - 8=, EIGHT, TEN, SIXTEEN, NINETEEN.

5° EXCERCISE: LET'S SUBSTRACT

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