Take Away Model Of Subtraction

Adding a neutral pair does not change the value.
Take away model of subtraction. We will need to use both positive and negative counters and sometimes some neutral pairs too. Recall familiar problems such as if harry had 30 marbles and 10 were taken away by his friend ron how many were left in symbol form that problem would be 30 10 20 which might have been read as 30 take away 20. Teaching all four models of subtraction take away comparison completion and whole part part can better train elementary school children to think abstractly and relate their math knowledge for the. Students used the pieces but were also taught.
Now let s see what happens when we subtract one positive and one negative number.