Addition Strategies

Students were refining their strategies for addition and used the 100's chart to help them solve addition questions to 20 (Grade 1's) and to 100 (Grade 2's).

We learned that each row is 10.
Move down one square and that's also 10.
That we can break 2 digits numbers down into 10's and 1's to help us use the 100's chart.
(For example, 17 is one square down and 7 squares to the right.)

Some Grade 2's took this a step further and were using the chart to subtract - using reverse operations to check their answers.  We will be starting subtraction strategies sometime next week.

Next strategy:  using a number line to find the sum and difference.