"Mixed Operations of Rational Numbers" PPT Courseware 3

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"Mixed Operations of Rational Numbers" PPT Courseware 3

Mixed operations on rational numbers

addition

Take the same sign and add the absolute values

If the different signs are different, take the sign with the larger absolute value. Subtract the absolute value.

Subtraction

Subtracting a number is equal to adding its opposite

multiplication

Take the positive of the same sign and multiply the absolute values

Negative with different sign

division

If the same sign is positive, divide by absolute value.

Negative with different sign

Dividing by a number is equal to multiplying by the reciprocal of that number

Mixing algorithm:

Calculate exponentiation first, then multiplication and division, and finally addition and subtraction;

If there are parentheses, calculate what is inside the parentheses first.

"24 o'clock" game

Poker cards (with the big and small kings removed) are mixed according to the numbers on the cards (each card can only be used once), so that the result of the operation is 24 or -24. Among them, red represents positive numbers, black represents negative numbers, and J, Q, and K represent 11, 12, and 13 respectively.

Review and reflection on rational numbers

Think about it: What did you learn in this lesson?

Mixing algorithm:

Calculate exponentiation first, then multiplication and division, and finally addition and subtraction;

If there are parentheses, calculate what is inside the parentheses first.

Review and Reflection What did you learn from this chapter?

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Update Time: 2024-11-17

This template belongs to Mathematics courseware Hebei Education Edition Seventh Grade Mathematics Volume 1 industry PPT template

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