Sign In
Sign Up
flag-sg

Addition strategies

0/5
Intros
Start Watching
Lessons
  1. Mental math and sums of 10
  2. Addition strategy #1: friendly numbers with adjustment
  3. Addition strategy #2: creating friendly numbers using addends
  4. Addition strategy #3: adding on from left to right
  5. Addition strategy #4: adding by counting on
0/21
Examples
Start Watching
Lessons
  1. Adding by grouping sums of 10
    Add by pairing up sums of 10. Circle the pair and fill in the blanks.
    1. 8 + 5 + 2 = ____
      10 + ____ = ____
    2. 1 + 7 + 3 = ____
      10 + ____ = ____
    3. 6 + 9 + 4 = ____
      10 + ____ = ____
  2. Adding by 9 strategy
    Add 9 by: adding 10 first, then taking 1 away. Fill in the blanks.
    1. 7 + 9 = ____
      7 + 10 = ____ - 1 = ____
    2. 14 + 9 = ____
      14 + 10 = ____ - 1 = ____
    3. 38 + 9 = ____
      38 + 10 = ____ - 1 = ____
  3. Adding by 8 strategy
    Add 8 by: adding 10 first, then taking 2 away. Fill in the blanks.
    1. 7 + 8 = ____
      7 + 10 = ____ - 2 = ____
    2. 16 + 8 = ____
      16 + 10 = ____ - 2 = ____
    3. 54 + 8 = ____
      54 + 10 = ____ - 2 = ____
  4. Adding using friendly numbers with adjustment
    Add by changing one number into a "friendly" number and adjust. Fill in the blanks.
    1. Addition Strategies
    2. Addition Strategies
    3. Addition Strategies
  5. Adding by making friendly numbers with given addends
    Add: make "friendly" numbers using given addends. Fill in the blank.
    1. Addition Strategies
    2. Addition Strategies
    3. Addition Strategies
  6. Adding on strategy
    Use the method of adding on from left to right.
    1. 553 + 385 = ____
    2. 730 + 291 = _____
    3. 664 + 148 = ____
  7. Counting on from the first number
    Add by counting on from the first number
    1. 104 + 693 = ____
    2. 827 + 335 = _____
    3. 568 + 429 = ____