Video: Determining the Unknown Whole Numbers in an Addition Equation

Here are some counters with numbers. Choose the two numbers that make the equation true. _ + 5 = _

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Video Transcript

Here are some counters with numbers: 14, seven, nine, six, 15. Choose the two numbers that make the equation true. What plus five equals the missing number?

So we need to choose two counters from the box. We will add one of them to five to make the other missing number. Let’s start by thinking about the possibilities for the first missing number.

If the first missing number was 14, 14 plus five would equal 19. But we don’t have a counter with number 19. So we know the first missing number isn’t 14. Could the first missing number be number seven? Seven plus five equals 12. But we don’t have a counter with a number 12 on it. So we know that seven is not the first missing number. Let’s try number nine. Nine plus five is 14. So nine and 14 could be our missing numbers.

The two numbers that make the equation true are nine and 14 because nine plus five equals 14.

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