Mental Math: Make 10

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Here’s a math problem: six plus eight. Your child will learn many mental math strategies to solve this, instead of memorizing.

Here’s one strategy: You can break apart a number to make a ten. When you make a 10, you break apart one number to make a 10 with the other number.

Use your Magic Math Fingers! One, two, three, four, five, six, seven, eight! Eight’s missing number partner is two.

We know six is the whole. We know one part is 2. What is the other part? Four! The other part is four! And look – We broke apart six! Now, if 8 plus 2 equals 10, we can easily add with a ten!

Look! We made a ten and we broke apart to show how six plus eight equals fourteen! This strategy will set your child up with strong mental math skills this year and for years after!

 

Grade 1 Common Core Standards

Operations & Algebraic Thinking: Add and subtract within 20.

(1.OA.6) Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g. knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

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