In the classroom, 1 1 the light went out. How many lights are still on? Is this a primary school math problem?

In the classroom, four lights of 1 1 went out and seven lights were still on.

Calculate the formula according to the meaning of the question:

1 1-4

So there are still seven lights on.

Subtraction calculation:

If you subtract a number from the sum of several numbers, you can choose any addend to subtract this number and add it to the rest of the addends. For example: (35+17+29)-25 = 35-25+17+29 = 56.

If you subtract several numbers from a number in succession, you can add all the subtractions first, and then subtract the sum of the subtractions from the minuend. For example: 276-115-85 = 276-(115+85) = 76.

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