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Adding and Subtracting Decimals
Why Do We Need Decimals? It helps makes things exact!
Why Do We Need Decimals? Money: One dollar and thirty two cents is the same thing as 1.32. Distance: Exactly how many miles is it from your house to school? (You couldnt say without decimals!)
Adding Decimals The problem: 36.78 + 47.90= ___?___
Adding Decimals is easy if you keep your work neat! Step 1: Line up the decimal points! Write zeros as place holders, if necessary. 36. 78 +47. 90
Step 2 Step 2: Add the hundredths. Regroup if necessary. 36.78 +47.90 8
Step 3 Step 3: Add the tenths. Regroup if necessary. 1 36.78 +47.90 68
Step 4 Step 4: Add the ones, then the tens. Place the decimal point! 11 36.78 +47.90 84. 68 37.78 + 47.9 = 84.68
Decimals – Subtraction 2 tenths - 1 tenth =1 tenth = tenths - 3 tenths =3 tenths = 0.3.
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Add and Subtract Decimals
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Adding and Subtracting decimals! Mr. Vachon says, “If you can carry, borrow, and line up place values… I bet you can add and subtract decimals as fast.
Students: Today is a red light day. Cell phone use is prohibited. This is your warning.
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