Decimal Rule
How do you round decimals
Look at which number it is asking us to round, go one column to the right then if 4 or below round down, 5 or up round up.
Round 2.34 to one DP
2.3
How do you add decimals?
Line up numbers by place value, lining up decimal points. Add normally and drop the decimal straight down into the sum.
4.65
How do you subtract decimals?
Line up numbers by place value, lining up decimal points. Subtract normally, borrowing when necessary and drop the decimal straight down into the difference.
Round 1.23 to 2 SF
1.2
What do you do if, after lining up by place value, there are not enough digits in the top number to subtract a problem?
Annex zeros.
18.7
How do you multiply decimals?
You ignore the decimal point and then multiply the numbers. When finished, count the number of decimal numbers in each of the factors to find how many decimal numbers will be in the product.
Round 18.098 TO 3 sf
18.1