Use DPP item C to practice the addition facts in Group B for which add zero is the strategy.
When students find the rule, ask
them to give number sentences for
several rows of the table. For
example, 1 + 0 = 1 for the first
row and 6 + 0 = 6 for the last
row.
C. Guess My Rule Again
If this machine has an adding rule, what can it be? Find the rule. Then complete the table.