Regrouping takes place whenever we get ten or more in one place value column. We then regroup ten of

1

• Regrouping takes place whenever we get ten or
  more in one place value column. We then regroup
  ten of that place as one in the next higher
  place. For example, if we get 12 in the ones
  place, we regroup that as 1 ten 2
  ones. Gr3-U3-L1

2

• An inverse operation will undo another operation.
  Addition and subtraction are inverse operations.
• For example, 3 4 7 and
• 7 - 4
  3 Gr3-U3-L2

3

• Fact families are sets of facts that are related
  just like families are. There are addition and
  subtraction fact families.
• For example, 3 4 7,
• 4 3 7,
• 7 - 4 3, and
• 7 - 3 4 are a fact family.
  Gr3-U3-L2

4

• When we add two or more amounts together, we find
  the total amount. Another name for the total is
  the sum, so the answer to an addition problem is
  call the sum.
  Gr3-U3-L2

5

• When we subtract, we are finding out how
  different one number is from another or how far
  apart they are on the number line, so the answer
  is called the difference.
  Gr3-U3-L2

6

• An inverse operation will undo another operation.
  Addition and subtraction are inverse operations.
  
• For example, 3 4 7 and
• 7 - 4 3
• Gr3-U3-L3

7

• Fact families are sets of facts that are related
  just like families are. There are addition and
  subtraction fact families.
• For example, 3 4 7,
• 4 3 7,
• 7 - 4 7, and
• 7 - 3 7 are a fact family.
  Gr3-U3-L3

8

• When we add two or more amounts together, we find
  the total amount. Another name for the total is
  the sum, so the answer to an addition problem is
  called the sum.
• Gr3-U3-L3

9

• When we subtract, we are finding out how
  different one number is from another or how far
  apart they are on the number line, so the answer
  is called the difference.
• Gr3-U3-L3

10

• You can change the legal name of a number to a
  nickname by regrouping. The amount the number
  represents doesnt change only the way it is
  described changes.
• Gr3-U3-L4

11

• When we need to subtract a larger digit from a
  smaller digit, we regroup one of the next biggest
  place and give the number a nickname.
• When you have checked each place and done all the
  regrouping needed, then you subtract.
• Gr3-U3-L4

12

• We can check a subtraction problem by using the
  inverse operation of addition. We can do this by
  adding back up, or adding the difference and the
  amount that was subtracted to get the original
  number.
• Gr3-U3-L4

13

• You can change the legal name of a number to a
  nickname by regrouping. The amount the number
  represents doesnt change only the way it is
  described changes.
• Gr3-U3-L5

14

• When we need to subtract a larger digit from a
  smaller digit, we regroup one of the next biggest
  place and give the number a nickname.
• When you have checked each place and done all the
  regrouping needed, then you subtract.
• Gr3-U3-L5

15

• When there are not enough ones to subtract from,
  we need to regroup 1 ten as 10 ones and give the
  amount a nickname.
• When there are not enough tens to subtract from,
  we need to regroup 1 hundred as 10 tens and give
  the amount a nickname.
  Gr3-U3-L5

16

• When we need to subtract a larger digit from a
  smaller digit, we regroup one of the next biggest
  place and give the number a nickname. When you
  have checked each place and done all the
  regrouping needed, then you subtract.
• Gr3-U3-L6

17

• When there is a zero in the place from which you
  need to regroup, you need to go to the next
  larger place and regroup into the place with the
  zero. Then regroup into the first place.
• Gr3-U3-L7

18

• When there is a zero in the place from which you
  need to regroup, you need to go to the next
  larger place and regroup into the place with the
  zero. Then regroup into the first place.
• Gr3-U3-L8

19

• It is important to keep our numbers lined up
  correctly when solving the problem on paper to
  avoid errors.
• When you have checked each place and done all the
  regrouping needed, then you subtract.
• It is also a good idea to check by adding back
  up. Gr3-U3-L9

20

• It is important to read carefully when figuring
  out how to solve a story problem. We need to
  look at the numbers that are given and what
  question the problem is asking. Then we can
  decide what to do to solve the problem.
• Gr3-U3-L10