The student uses patterns in numbers and operations. For example, the tens digits increase by one as you go down the chart, but the ones digits stay the same. The student uses patterns in numbers and operations.
Students use place value to first compare the hundreds.
If there are the same amounts of hundreds in all four numbers, then they compare the tens. The student uses patterns in numbers and operations. Students use the appropriate strategy to find each sum. Students then can re-sort the cards according to another strategy, such as counting on one or counting on two, and use the new strategy to find the sums. The student uses patterns in numbers and operations.