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Subtraction Using an Abacus (Section 1.4)
Pre Algebra Supplemental Instruction Video<br />Aligned to Common Core State Standard: 6.NS.5
Subtracting Numbers on an Abacus Part 1
Subtracting Numbers on an Abacus Part 2
Understand that positive and negative numbers are used together to describe quantities having opposite directions or values (e.g., temperature above/below zero, elevation above/below sea level, credits/debits, positive/negative electric charge); use positive and negative numbers to represent quantities in real-world contexts, explaining the meaning of 0 in each situation.