🔢 MathGrade 2Lesson 16
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Play Math Fact Games

Lesson preview: the Mini Lesson and Vocabulary are open to everyone. Guided practice, exercises, the parent checklist and the printable PDF worksheet come with full access (free 7-day trial or membership).

Learning Objectives

  • 1Recall addition and subtraction facts to 20 quickly
  • 2Use fact families to link addition and subtraction
  • 3Find the missing number in a fact using the inverse operation
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Mini Lesson

Math facts are the basic addition and subtraction equations you use every day. When you can recall them instantly — without counting — harder math becomes much easier!

What is a math fact?

  • A math fact is a simple equation you recall from memory, such as 7 + 8 = 15 or 13 − 5 = 8.
  • Addition and subtraction facts are linked as fact families. Knowing 6 + 8 = 14 gives you 14 − 8 = 6 for free.

Three ways to practice math facts

  • Flash cards: Cover the answer and try to recall it. Shuffle each round.
  • Speed drill: Write as many facts as you can in 2 minutes on your paper worksheet, then check.
  • Partner game: Say the start of the fact ("7 + 8 =") and race to call the answer first.

Finding a missing number in a fact

  • If you see 6 + ___ = 14, think: "What do I add to 6 to get 14?" Use the inverse: 14 − 6 = 8, so the answer is 8.
  • If you see ___ − 5 = 9, think: "What minus 5 gives 9?" Use the inverse: 9 + 5 = 14, so the answer is 14.
Six addition facts to 20Six fact cards in two columns: 6+7=13, 7+8=15, 8+6=14, 9+4=13, 5+9=14, 8+8=16. Below: tip cards showing how to find a missing number using the inverse.Know These Facts!6 + 7 = 137 + 8 = 158 + 6 = 149 + 4 = 135 + 9 = 148 + 8 = 16Missing number tip (addition):6 + ___ = 14 → think 14 − 6 = 8Missing number tip (subtraction):___ − 5 = 9 → think 9 + 5 = 14
Six addition fact cards to memorize, with two tip cards showing how to find a missing number using the inverse operation.
Fact family for 6, 8, and 14Four fact cards arranged in a two-by-two grid showing the complete fact family: 6+8=14, 8+6=14, 14−6=8, 14−8=6.Fact Family: 6, 8, 146 + 8 = 14addition sum = 14addend + addend8 + 6 = 14addition commutativeorder flipped14 − 6 = 8subtraction inversestart with sum14 − 8 = 6subtraction inverseother addend
The complete fact family for 6, 8, and 14 — two addition facts (blue) and two subtraction facts (orange), all linked by the same three numbers.
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Ask yourself: "Do I know this fact from memory? If there is a missing number, can I use the inverse to find it?"

Vocabulary
Math fact
A simple equation you remember from memorye.g. 7 + 8 = 15 is a math fact.
Recall
To remember something quicklye.g. I can recall 7 + 8 without counting.
Fact family
Three numbers that make four related equationse.g. 6, 8, and 14 are a fact family.
Inverse
The opposite operation that undoes anothere.g. Use the inverse to find a missing number.
Flash card
A small card with a math fact you practicee.g. I covered the answer on the flash card and tried to recall it.
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← Lesson 15: Subtract with BorrowingLesson 17: Learn Concept of Repeated Addition →