Subtraction Paper Calculator^tm

How to use this Paper Calculator tm for subtraction. 1) Place 20 counters into this instruction box. You can use small rolled up pieces of paper, paper clips, beans or small stones. 2)Place your Basic subtraction worksheet next to the paper calculator on the table. 3)Move as many counters (from this instruction box) as the first number in the problem on to the top number line on this paper calculator from this instruction box. 4)Move as many counters (from the top numberline) as the second number in the problem on to the bottom number line on this paper calculator. 5) Count the number of counters on the top number line and write that number on the basic substraction worksheet.

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