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Grade 3 - Mathematics
5.3 Kinds of Subtraction

There are four kinds of subtraction:
  • Compare
  • Additive
  • Subset
  • Take away
Compare: Comparing two quantities.
Example: Ages of two people

Additive: Comparing two quantities and addition performed to equate smaller quantity to the larger quantity.
Example: Number of days to be added to a week to reach 30 days.

Subset: A part of the whole quantity.
Example: Number of red balls from a basket containing many balls.

Take away: Finding the difference between the whole and the subset.
Example: Subtracting the number of Sundays from a month.


Directions: Write the kind of subtraction in each case. Also write at least five examples of your own for each kind.
Q 1: Kelsey and Ellen dropped 4 pieces of food into the crayfish bowl. Sandy ate 2. How many are left? Name the type of subtraction.
Take away
Compare
Subset
Additive

Q 2: We need to read 60 hours to earn a pizza party. So far we have read 23 hours. How many hours do we still need to read? Name the type of subtraction.
Subset
Compare
Take away
Additive

Q 3: We ordered 12 crayfish and 4 died. How many are left? Name the type of subtraction.
Take away
Compare
Subset
Additive

Q 4: Mrs. Matzik baked 30 cookies. Twenty were shaped like pumpkins, how many were not?Name the type of subtraction.
Subset
Additive
Take away
Compare

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