Teacher2Teacher 
Q&A #522 
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From: Bonnie To: Teacher2Teacher Public Discussion Date: 1999020413:21:04 Subject: teaching substraction In refrence to Teacher2Teacher Service,Teaching subtraction. Before a child can learn barrowing in subtraction he or she has to know all the numbers on the top represent 10. In the example you have, to start with you would have to take one 10 from nine 10's leaving eight 10,s making the 0 next to the 9 , 1010s then take one ten from the 1010s making the 1010s 910s the ten you took from the 1010s goes on the last 0 making that 1010s. So now it is 10  4 =6 9 7=2 87= 1. Now 85=3 53=2 42=2. This is the best I can explain it for this example: 458900  235774 _________
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