Addition Sentences for Even & Odd Numbers
πͺ Math Magic! Adding Even and Odd numbers together follows a secret set of rules. Once you know the rules, you can predict the answer without doing any math!
Do this: Read the concept below, then try the quiz or activity.
Concept
There are three magic rules for adding Evens (numbers that pair up perfectly) and Odds (numbers with an odd-one-out).
π― The Magic Rules: 1. Even + Even = EVEN. (If everyone has a partner in group 1, and everyone has a partner in group 2... when they join together, everyone still has a partner!) *Example: 4 + 6 = 10.* (All even!)
2. Odd + Odd = EVEN. (Wait, what?! If group 1 has a leftover guy, and group 2 has a leftover guy... when they join together, those two leftovers become partners!) *Example: 3 + 5 = 8.* (Two odds made an even!)
3. Even + Odd = ODD. (If group 1 has perfect partners, and group 2 has an odd-one-out... when they join together, that one guy is STILL left out!) *Example: 4 + 3 = 7.* (An even and an odd always make an odd.)
Try it
Predict the future!
Instructions: Look at the two numbers. Use the magic rules to predict if the answer will be Even or Odd! You don't even have to solve the math!
Problem 1: 12 + 4 = ? * 12 is Even. 4 is Even. * Rule: Even + Even = ________
Problem 2: 7 + 5 = ? * 7 is Odd. 5 is Odd. * Rule: Odd + Odd = ________ (Remember the two leftovers become a pair!)
Problem 3: 10 + 9 = ? * 10 is Even. 9 is Odd. * Rule: Even + Odd = ________
Problem 4: 100 + 100 = ? * Without doing the math, will the answer be Even or Odd? * ________