Addition and Subtraction Strategies

• that there are multiple ways to make 10.

Example:

9 + 1 = 10

8 + 2 = 10

7 + 3 = 10

6 + 4 = 10

• how to use a number line to solve addition and subtraction problems.

Example:

9 + 3 = ___ → start on the 9 and move 3 spaces to the right

9 − 3 = ___ → start on the 9 and move 3 spaces to the left

• how to use doubles and near doubles facts to help add.

Example: We know 5 + 4 = 9 because it is one less than the doubles fact 5 + 5 = 10.

• how to use strategies, such as a part-part whole diagrams, to determine related facts (fact families).
• how to explain and solve addition and subtraction word problems using bar models.
• how to add and subtract within 20 using different strategies, including making 10 and breaking down a number into parts of 10.

Example: 8 + 5 → 8 + (2 + 3) → (8 + 2) + 3 → 10 + 3 = 13

• how to add and subtract using two or three numbers with different strategies, including doubles, near doubles, and making ten.

Example: 6 + 6 + 2 = _____ → 12 + 2 = ____ (adding doubles first)

● how to solve addition and subtraction word problems in different ways.

Resources

• Videos
  • The Friends of Ten. This Friends of Ten song uses a song to show different ways of making ten.
  • Doubles and Near Doubles. This Doubles and Near Doubles video explains how to use the doubles and near doubles strategies when solving addition problems.
  • Fact Families. Related Facts are explained and show how addition and subtraction are related. They can be used to solve for a fact family.
  • Make Ten Strategy. This video explains how to use the make ten to add strategy to add two numbers.
  • Add within 20 by Regrouping on a Ten Frame. Using ten frames to show making ten in order to add numbers and find sums up to 20 is a strategy modeled in this clip.
  • Teaching the Think Addition Strategy for Subtraction. This Origo video examines the relationship between fact families and inverse operations.
• Free Apps

• Websites
  • Ten Frame. This game reinforces subitizing by finding the number of counters and empty spaces on a ten frame to make ten.
  • Number Bonds 10. The Math Playground Number Bonds game is a fun way for your child to connect addends of ten together.
  • Museum of Tens. Curious George works to make ten on a museum visit and needs help.
  • Doubles Alien Attack. This Snappy Math Alien Attack game allows your child to practice the doubles facts.
  • Molly Adds & Subtracts From 20. This ABCya! game provides engaging word problems and virtual manipulatives to solve word problems.
  • Thinking Blocks Junior. Your child will create bar diagrams to represent given addition or subtraction word problems.
• Books
  • The Fact Family by Sandy Turley. This rhyming story helps explain related facts in a number sentence. Online read aloud version.
  • Double the Ducks by Stuart J. Murphy. Double the Ducks tells all about doubling. Online read aloud version.
  • Ten Friends by Bruce Goldstone. This story uses rhymes and illustrations to suggest different ways to invite ten friends to tea.