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# Adding and Subtracting Decimals. Why Do We Need Decimals? It helps makes things exact!

## Presentation on theme: "Adding and Subtracting Decimals. Why Do We Need Decimals? It helps makes things exact!"— Presentation transcript:

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

The end!

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