K5 Learning advises parents on how to teach their kids how to subtract negative numbers.
Positive and Negative Integers Poster
adding subtracting Worksheets
KS3 Maths: How to add and subtract positive and negative numbers - BBC Bitesize
Subtracting Positive and Negative Numbers
Negatives Addition and Subtraction Textbook Exercise – Corbettmaths
Negative and Positive Numbers: Worksheets and Activities
Adding and Subtracting Positive and Negative Numbers
Relentlessly Fun, Deceptively Educational: Adding and Subtracting Positive & Negative Numbers with a Zipper Bag
Adding and Subtracting Positive and Negative Numbers
Operations with positive and negative numbers