# Question Video: Finding the Missing Number Using Comparison Symbols Mathematics • 1st Grade

Hannah made three numbers with place value cards. 20 + 8 = 28, 50 + 2 = 52, 50 + 7 = 57. Pick the correct number sentences. Remember, to compare 28 and 52, we compare the tens digit. [A] 28 = 52 [B] 28 < 52 [C] 28 > 52. 57 and 52 have the same tens digit. Compare the ones digit to find the correct number sentence. [A] 57 < 52 [B] 28 = 52 [C] 57 > 52. Which is the greatest number that she made?

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### Video Transcript

Hannah made three numbers with place value cards. 20 plus eight is 28, 50 plus two is 52, and 50 plus seven is 57. Pick the correct number sentences. Remember, to compare 28 and 52, we compare the tens digit. Is 28 equal to 52, less than 52, or greater than 52? 57 and 52 have the same tens digit. Compare the ones digit to find the correct number sentence. 57 is less than 52, equal to 52, or greater than 52. Which is the greatest number that she made?

This is a three-part question. In the first part of the question, we need to compare the numbers 28 and 52. We’re told how to do this. By comparing the tens digits. And if we look closely at the place value cards, we can see that 28 has two 10s and 52 has five 10s. We know that five is more than two, so 52 must be greater than 28 because 50, or five 10s, is greater than 20 which is two 10s. So 28 is less than 52.

In the second part of the question, we have to compare the numbers 57 and 52. And we’re told to do this by comparing the ones digit. This is because 57 and 52 both have the same number of 10s. They both have five 10s. Let’s compare the ones. 52 has two ones. 57 has seven ones. And we know that seven is greater than two, so we can say that 57 is greater than 52. So which is the greatest number that Hannah made? It’s the number 57. 57 has five 10s and seven ones; 28 only has two 10s. And although 52 has five 10s, it only has two ones. 57 has the most 10s and ones.