Even or odd: arithmetic rules

Learning Objectives Predict if the sum of two numbers is even or odd without calculating the exact answer. Predict if the difference between two numbers is even or odd without calculating the exact answer. Predict if the product of two numbers is even or odd without calculating the exact answer. Explain the rule for adding two odd numbers (Odd + Odd = Even). Explain the rule for adding an even and an odd number (Even + Odd = Odd). Apply the even and odd arithmetic rules to check their answers in addition, subtraction, and multiplication problems. If you have an even number of socks and your friend gives you an odd number of socks, will you be able to make perfect pairs with all of them? 🧦 Today, we are going to learn some amazing math shortcuts! These are special rules tha...

TermDefinitionExample Even NumberA whole number that can be divided into two equal groups with nothing left over. Even numbers always end in 0, 2, 4, 6, or 8.The number 12 is even because you can make two equal groups of 6. (6 + 6 = 12) Odd NumberA whole number that has one left over when you try to divide it into two equal groups. Odd numbers always end in 1, 3, 5, 7, or 9.The number 7 is odd because if you make two groups of 3, there is 1 left over. (3 + 3 + 1 = 7) SumThe answer you get when you add two or more numbers together.In 5 + 4 = 9, the sum is 9. DifferenceThe answer you get when you subtract one number from another.In 10 - 3 = 7, the difference is 7. ProductThe answer you get when you multiply two or more numbers together.In 2 x 6 = 12, the product is 12. Arithmetic RuleA patt...

Addition & Subtraction Rules Even ± Even = Even Odd ± Odd = Even Even ± Odd = Odd Use these rules to predict if the sum or difference of two numbers will be even or odd. Notice that if the numbers are the same type (both even or both odd), the answer is Even. If they are different types, the answer is Odd. Multiplication Rules Even × Any Number = Even Odd × Odd = Odd Use these rules to predict if a product will be even or odd. The most important rule here is that if you multiply ANY number by an even number, the answer will ALWAYS be even.