Additive Thinking

Although the Additive Thinking section is not yet ready, we wanted to add some videos you might find helpful.

Pocket Subtraction – when the Minuend ends in Zero

This strategy is useful in subtraction questions where the “starting” number ends in a zero.

Pocket Subtraction – when the Subtrahend ends in 9

This strategy is useful in subtraction questions where the number that is being subtracted ends in 9.

Adding 2 Digit Numbers – without regrouping

This video is Part 1 of the 2 part series “Addition of 2 Digit Numbers – Partitioning by Place Value”. Part 1 focuses on building and solving 2 Digit Addition questions that do not require regrouping. You will then compare this method to the traditional algorithm.

You will need access to one of the following:

• Physical Base Ten Blocks (tens and ones)
• Printable Base Ten blocks (print in black and white OR color)
• Virtual Base Ten Blocks e.g. CPM Tiles 

Adding 2 Digit Numbers – with regrouping

This video is Part 2 of the 2 part series “Addition of 2 Digit Numbers – Partitioning by Place Value”. Part 2 focuses on building and solving 2 Digit Addition questions that require regrouping. You will then compare this method to the traditional algorithm.

You will need access to one of the following:

• Physical Base Ten Blocks (tens and ones)
• Printable Base Ten blocks (print in black and white OR color)
• Virtual Base Ten Blocks e.g. CPM Tiles