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Aaylah loves getting cards from her friends. Darajah gave her 15 cards for Valentines day. Olivia gave her 12 cards for Valentines day, and Daniela also gave her 12 cards. At the end of the day Aaylah counted 45 Valentines cards from her friends but some of them didn't have a name on them. How many cards did Aaylah receive that did not have a name on them?
Write a number sentence for this problem and solve using a number line.
What is 45 - 12 - 12 - 15 = ?
or
12 + 12 + 15 + ? = 45
The answer is Aalyah had 6 Valentines cards with no name on them.