Today we did more work on UK money, learning to subtract from an amount in pounds by using a decimal point and two zeroes. Check out the example on the board. After setting the calculation out you have to decompose before you can subtract. The 2 in the tens column becomes a 1, which makes 10 in the next column (units). Then we can borrow from the units, leaving 9 units and putting 10 in the tenths column. At last we are ready to subtract. We must not forget the decimal point and the pound sign in the answer.
Tuesday, April 3, 2012
Maths: subtracting money
Today we did more work on UK money, learning to subtract from an amount in pounds by using a decimal point and two zeroes. Check out the example on the board. After setting the calculation out you have to decompose before you can subtract. The 2 in the tens column becomes a 1, which makes 10 in the next column (units). Then we can borrow from the units, leaving 9 units and putting 10 in the tenths column. At last we are ready to subtract. We must not forget the decimal point and the pound sign in the answer.
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