# 7th math Add and subtract rational Numbers

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## tucci_k

Updated 2 months ago

1. Word cloud
120 seconds
What is the basic operation for rational numbers?
2. Slide
60 seconds
Rational numbers are numbers that can be written as fractions with integers in the numerator and denominator. To add rational numbers, add the numerators of the fractions and keep the denominator the same. To subtract rational numbers, subtract the numerators and keep the denominator the same.
3. Poll
60 seconds
Do you prefer to add or subtract rational numbers?
• Subtract them
• Neither, I find it equally difficult
4. Slide
60 seconds
Did you know?
The process of adding and subtracting rational numbers is called rational arithmetic. The first mathematician to formally define the process of rational arithmetic was the ancient Greek mathematician Euclid. The process of adding and subtracting rational numbers is used in cryptography to encrypt and decrypt data.
5. Open question
300 seconds
What strategies can we use to add and subtract rational numbers?
6. Open question
300 seconds
How can we identify when a sum or difference of two rational numbers is positive or negative?
7. Personalised Feedback
360 seconds
If you add a positive rational number to a negative rational number, what is the sign of the resulting sum? Explain your reasoning.
8. Open question
300 seconds
How has working with rational numbers helped you develop a better understanding of the relationship between addition and subtraction?
9. Open question
300 seconds
What challenges have you faced in adding and subtracting rational numbers and how did you overcome them?