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Colegio Internacional Cartagena
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Área: Math Asignatura: Math Curso: 5
th th
Fecha: August 13 -19 Periodo III Nº Horas: 5hr Semana: 6
Docente: Gerardo Núñez Coronado
Tema: ADDING AND SUBTRACTING DECIMALS
Indicador Add and subtract decimals in tenths, hundredths, and combinations of whole
de Logro numbers, tenths and hundredths.
Exploración
Contextualización
WATCH THE VIDEO: http://www.youtube.com/watch?v=Mn3BKVuWVP4. DECIMALS
EMOCIÓN
Conceptualización
ADDING AND SUBTRACTING DECIMALS
If you know how to add and subtract whole numbers, then you can add and
subtract decimals! Just be sure to line up the terms so that all the decimal
points are in a vertical line.
To add decimal numbers:
1. Put the numbers in a vertical column, aligning the decimal points.
2. Add each column of digits, starting on the right and working left. If the
sum of a column is more than ten, "carry" digits to the next column on
the left.
3. Place the decimal point in the answer directly below the decimal points in
the terms.

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To subtract decimal numbers:
1. Put the numbers in a vertical column, aligning the decimal points.
2. Subtract each column, starting on the right and working left. If the digit
being subtracted in a column is larger than the digit above it, "borrow" a
digit from the next column to the left.
3. Place the decimal point in the answer directly below the decimal points in
the terms.
4. Check your answer by adding the result to the number subtracted. The
sum should equal the first number.
Producción
ACCIÓN

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Modelación
Workshop
ADD.
9. Baseball legend Ty Cobb averaged 4.875 home runs per season for his
career. Hank Aaron averaged 22.255 more per season than Cobb. How many
home runs did Hank Aaron hit per season?
a. 27.821
b. 26.27
c. 27.13
d. 26.103

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Colegio Internacional Cartagena
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SUBTRACT.
13. Mrs. Pauli budgeted $125 per week for groceries for her family. If she
spent $53.76 by Tuesday and another $47.28 on Wednesday and Thursday,
how much did she have left for the last two days of the week?
a. $19.54
b. $23.96
c. $20.86
d. $24.06
Lectura Complementaria:
http://www.ixl.com/math/grade-5/add-and-subtract-decimal-numbers
http://www.ixl.com/math/grade-5/add-and-subtract-decimals-word-problems
http://www.ixl.com/math/grade-5/choose-decimals-with-a-particular-sum-or-difference
http://www.harcourtschool.com
http://www.ixl.com