On our recent math assessment, all of our students showed us how much they know about addition and solving story problems. It was a really difficult math assessment, and our students did really well! They worked really hard and persisted even though the problems were tough.
Here are two problems that caused confusion amongst some first graders.
There were five boys at Jake's party. Some more came after basketball practice. Then there were 9. How many boys came to Jake's party after basketball practice? Draw a picture to help you solve the problem. Draw a complete number bond that goes with this story. Write an addition sentence to match this story.
Monica says when the unknown is 4, it makes this number sentence true: 5 + 3 =
___4__ + 4.
Terry says she is wrong. He says 8 makes the number sentence true.
a) Who is correct? Explain your thinking using pictures, words or numbers.
b) Monica says that 3 and 5 is equal to 5 and 3. Terry says she is wrong again. Explain who is correct, using pictures, numbers or words.
c) Next, Monica tells Terry 8=8. Terry says she is wrong one more time. Explain who is correct, using pictures, numbers or words.
d) Terry decided to share 8 carrot sticks with his friend Monica. Monica put 5 carrot sticks on her plate and some more in her lunch box. How many carrot sticks did Monica put in her lunch box?