Adding 3-digit Numbers

• Add 3-digit numbers using an open number line? (2nd grade)
• Add 3-digit numbers using expanded form? (2nd grade)

Subtraction 

• Base Ten Sketch
• Keep One Break One
• Expanded Form (without Regrouping)
• Compensation for Subtraction  (This is Great When You have A LOT of Zeroes)
• Subtraction Using a Number Line (Regrouping)
• Expanded Form (with Regrouping)

Addition Tutorials

How do I count on using my fingers and a number line?

How do I count on using a number line?

How do I add using a base ten sketch?

How do I add using an open number line?

How do I add using the ‘Keep One, Break One,’ strategy?

How do I add double digit numbers using the ‘Keep One, Break One,’ strategy?

How do I add using expanded form?

How do I add with regrouping by using a base-ten sketch?

How do I add 3-digit numbers using an open number line?

How do I add 3-digit numbers using expanded form?

How do I solve for a missing addend by counting up?

Subtraction Tutorials

How do I subtract with regrouping using a base-ten sketch?