Choose 1 of the blue problems. Solve it using counting on or counting back.
Answers vary; encourage students to demonstrate their understanding of counting on to add, or counting back to subtract.
Choose another blue problem. Solve it by making a ten.
Answers vary; encourage students to demonstrate their understanding of making a ten to add and subtract.
Choose another blue problem. Solve it using doubles or doubles plus or minus 1.
Answers vary; encourage students to demonstrate their understanding of doubling to add and subtract.
Look at the purple problems. How are they the same? How are they different?
They have the same 2 numbers in a different order.
Will they have the same sum?
Yes. Changing the order of the numbers is okay in addition.
Look at the green problems. How are they the same? How are they different?
They have the same 2 numbers in a different order.
Will they have the same difference?
No. Changing the order is not okay in subtraction.
Look at the pink problem. Does it matter which 2 numbers you need to add first? Why or why not?
No. The sum will be 11, no matter which 2 numbers you start with.
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