Standard: 1.NBT.C.4
Add within 100, including adding a two-digit number and a one-digit number, and
adding a two-digit number and a multiple of 10, using concrete models or drawings
and strategies based on place value, properties of operations, and/or the relationship
between addition and subtraction; relate the strategy to a written method and
explain the reasoning used. Understand that in adding two-digit numbers, one adds
tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
Math Practice Standards:
MP3, MP5, MP8
Task Exemplar:
When Eddie arrived at the ball game, his team had already scored 28 points. While he
watched the rest of the game, they scored 7 more points.
Part A
How many points did Eddie’s team have when the game ended? Make a model or
drawing to help you solve this problem. Explain your thinking.
Part B
When Eddie went to the next game, the total amount of points scored by both teams was
43. One team scored a two-digit number and the other team scored a single digit number?
What might the numbers be? Make a model or drawing to help you solve this problem.
Explain your thinking.