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Adding and Subtracting Decimals
Mrs. Thomas 6th grade Math
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Objectives We will learn to: add decimals subtract decimals
apply adding and subtracting decimals to problem solving
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To add decimals… Step 1: Write the numbers so that the decimal points line up. Visualize a place value chart to help line up the decimal points. Take ones decimal point tenths hundredths thousandths 1 . 9 3 +
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To add decimals… . Step 2: Add zeros as place holders if needed. 1 9 3
ones decimal point tenths hundredths thousandths 1 . 9 3 +
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To add decimals… . Step 3: Add. Regroup if necessary.
Write a decimal point in the answer under the decimal points in the numbers you are adding. (Basically, bring the decimal point down.) ones decimal point tenths hundredths thousandths 1 . 9 3 + 5
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Now, let’s try… = = = = = =
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Let’s try adding decimals…
ones decimal point tenths hundredths thousandths . +
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The same rules apply when adding 3 or more decimals
ones decimal point tenths hundredths thousandths . +
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To subtract decimals… . 1 5 - 6
Step 1: Write the numbers so that the decimal points line up. Visualize a place value chart to help line up the decimal points. Remember, it helps to put the larger number on top. Take 1.5 – 1.06 ones decimal point tenths hundredths thousandths 1 . 5 - 6
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To subtract decimals… . Step 2: Add zeros as place holders if needed.
ones decimal point tenths hundredths thousandths 1 . 5 - 6
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To subtract decimals… . Step 3: Subtract. Regroup if necessary.
Write a decimal point in the answer under the decimal points in the numbers you are subtracting. (Basically, bring the decimal point down.) ones decimal point tenths hundredths thousandths 1 . 5 - 6
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To subtract decimals… . Step 3: Subtract. Regroup if necessary.
Write a decimal point in the answer under the decimal points in the numbers you are subtracting. (Basically, bring the decimal point down.) ones decimal point tenths hundredths thousandths 1 . 4 5 10 - 6
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Now, let’s try… = 96.2 – 31.1 = 0.864 – = 9.62 – 8.12 = 0.468 – = 0.783 – =
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Let’s try subtracting decimals…
ones decimal point tenths hundredths thousandths . -
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