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Adding & Subtracting Decimals

Mathematics, Grade 4

 
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16.58 + 27.8 27.8 16.58 Step 1 Step 2 Step 3 Step 4 Step 1 Step 2 Step 3 Step 4 Line up the decimal points. Write zeros as place holders, if needed. Add the hundredths. Carry (regroup) if needed. Add the tenths. Carry (regroup) if needed. 0.62 + 0.34 = 0.96 1.8 1.2 = 0.6 Decimal Models Adding Decimals with Grids Adding Decimals Subtracting Decimals Subtracting Decimals with Grids 1.0 one whole (1) 0.1 . 01 1 10 hundredths 1 100 thousandths 1 1000 + + ones tens tenthshundr edths ones tens tenthshundr edths 1 1 1 6 5 8 . 2 7 8 0 4 4 3 8 . + 1 1 6 5 8 . 2 7 8 0 . 3 8 + 1 6 5 8 . 2 7 8 0 . 1 6 5 8 . 2 7 8 0 . 8 Line up the decimal points. Write zeros as place holders, if needed. Regroup if needed. Subtract the hundredths. Regroup if needed. Subtract the tenths. Regroup if needed. Subtract the ones, then the tens. Drag the decimal point straight down. ones tens tenthshundr edths ones tens tenthshundr edths 1 7 10 7 10 7 10 6 5 8 . 2 7 8 0 1 1 2 2 . 1 6 5 8 . 2 7 8 0 . 2 2 1 6 5 8 . 2 7 8 0 . 1 6 5 8 . 2 7 8 0 . 2 . . © Copyright NewPath Learning. All Rights Reserved. 93-4404 www.newpathlearning.com Adding & Subtracting Decimals 0.001
16.58 + 27.8 27.8 16.58 Step 1 Step 2 Step 3 Step 4 Step 1 Step 2 Step 3 Step 4 Line up the decimal points. Write zeros as place holders, if needed. Add the hundredths. Carry (regroup) if needed. Add the tenths. Carry (regroup) if needed. 0.62 + 0.34 = 0.96 1.8 1.2 = 0.6 Decimal Models Adding Decimals with Grids Adding Decimals Subtracting Decimals Subtracting Decimals with Grids 1.0 one whole (1) 0.1 . 01 1 10 hundredths 1 100 thousandths 1 1000 + + ones tens tenthshund redths ones tens tenthshund redths 1 6 5 8 . 2 7 8 0 . + 1 6 5 8 . 2 7 8 0 . + 1 6 5 8 . 2 7 8 0 . 1 6 5 8 . 2 7 8 0 . Line up the decimal points. Write zeros as place holders, if needed. Regroup if needed. Subtract the hundredths. Regroup if needed. Subtract the tenths. Regroup if needed. Subtract the ones, then the tens. Drag the decimal point straight down. ones tens tenthshund redths ones tens tenthshund redths 1 6 5 8 . 2 7 8 0 . 1 6 5 8 . 2 7 8 0 . 1 6 5 8 . 2 7 8 0 . 1 6 5 8 . 2 7 8 0 . . . © Copyright NewPath Learning. All Rights Reserved. 93-4404 www.newpathlearning.com Adding & Subtracting Decimals 0.001 Key Vocabulary Terms add decimal decimal point hundredth regroup subtract tenth thousandth \|xiBAHBDy01634sz\
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