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2-28.

Add or subtract.

  1. Add the numbers in the hundredths place.

    Add the numbers in the tenths place. Since the sum is 2 digits, place the first digit (1) in the column to the left.

    Add the numbers in the ones place. Since the sum is 2 digits, place the first digit (2) in the column to the left.

    Add the numbers in the tens place.

     

     

      

     

  1. See part (a). Be careful to line up the decimals correctly.

  • Since 0 is less than 4 in the hundreths place, borrow 1 from the column to the left, making the hundredths place 10 − 4 = 6.

    Now the tenths place is 0 − 0 = 0.

    Subtract the numbers in the ones place.

    Subtract the numbers in the tens place.