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Hello, my name is Kiley, and welcome to Problem Solving Strategy 8: Write a Number Sentence or Equation. You probably already know what number sentences are because youve used them. Do these look familiar? In this video, youll learn how to use number sentences to solve a word problem. A number sentence is an equation made up of numbers; operation symbols, like addition, subtraction, multiplication, or division; and an equality symbol. In order for this sentence to be true, what is on one side of the equality symbol should be equal to what is on the other side. For example, 4 + 7 = 11. This is a true number sentence because what is on one side of the equal sign is the same, or equal to what is on the other side. Now lets look at how to use number sentences, or equations, to help you solve word problems. Mike has 6 marbles. Luke has 4. How many marbles do they have in all? OK, so you know that we can act it all out, draw a picture, or use a number line to solve this problem. We can