Dedicated to EDUC 327, Abby, Oksana, Sam, and Aiden.
Charles the bear is having a party to celebrate the first day of spring. Charles sent out invites to all of his friends to come to the party at 5 pm.
Luna the horse arrived at 4:30 pm to help set up the balloons. Then, Sani, the elephant came at 4:45 pm with a gift. Then both Guillermo the rat and Boberto the fish arrived at 5:05 pm.
For the party, Charles ordered 48 confetti cupcakes and another 31 cucumber cupcakes (elephants eat a lot). The cupcakes will be arriving at 6 pm. Charles wants to know how many cupcakes he will have in all for the party to make sure there will be enough.
48
31
Charles tries to count on his figures, "1, 2, 3, 4, 5, 6, 7, 8, 9, 10....". After counting to 10 Charles gets lost, counting above 10 with your fingers can get confusing.
So, Charles asks his friends to help him figure out how many cupcakes he will have with 48 confetti and 31 cucumber cupcakes. As a group, they decide the math problem will be an addition problem and would be written as 48+31=?
Each of his friends thinks of a different way to solve the math problem of 48+31.
You could use base ten blocks.
You could use a break apart model.
You could use tens frames.
You could use a jump model.
Now as the reader it is your job to help Charles choose which friend's model to use, flip to the page listed to see how they solve the problem.
Sani the elephant: pg. 9
Luna the horse: pg. 10
Boberto: pg. 11
Guillermo: pg. 12
We have 7 longs
and 9 cubes,
so in all we have
79 cupcakes.
48+31=? Each long is equal to 10 and each cube is equal to 1.
48, has 4 longs and
8 cubes.
31, has 3 longs and
1 cube.
Now all we have to do is added the longs together and add the cubes together.
Base-Ten Blocks
Then we can take the 70 and the 9 and add them together, so in all, we have 79 cupcakes.
48+31=? We might not
know right away what
48+31 is, but we do
know what 40+30 is.
We should break 48
into 40+8 and break
31 into 30+1. Then we
can add 40+30 and 8+1.
Break Apart Model
48+31=? We can use a number line and start with our first number 48. From there we can add 2 and jump to 50. We know 48+2=50. When we added 2 to 48 we had to take that 2 from 31, so we would have 29 left to add, but 29 is close to 30 so we rounded 29 to 30. In the end, we have to take that 1 back from our 80. Leaving us with 79 cupcakes in all.
Jump Model
48+31=? We know that 1 tens frame has 10 in it, so 4 full tens frames and 8 leftover is the same as 48.
So, 3 full tens frames and 1 leftover is 31.
Tens Frames
We have 7 full tens frames and 9 ones leftover, so we have 79 cupcakes in all.
Even though each of Charles' friends used a different addition model they all got the same answer. Now Charles knows he will have 79 cupcakes, they all agree that is enough cupcakes for the party.
At 6 pm the cupcakes arrive, Charles now wonders how many more or how many fewer cupcakes he would have had to order, to have had an even number of cupcakes? Can you help Charles figure it out?
- This book uses base ten blocks, ten frames, a jump model, and a break-apart model to show double-digit addition. The class could use ten frames, number lines, and base ten blocks when solving the specific models. The teacher could break the class into groups and each group could use a different model to find the answer, then the groups could compare their answers.
- The book also addresses the idea of time and could be used to talk about adding and subtracting time.
- The end of the book asks the reader to figure out how many more to add or subtract to make an even number, this could be an exercise looking at even and odd numbers. Each student could try to come up with their own even number and tell the class how much they added or subtracted to get their even number.
Dedicated to EDUC 327, Abby, Oksana, Sam, and Aiden.
Charles the bear is having a party to celebrate the first day of spring. Charles sent out invites to all of his friends to come to the party at 5 pm.
Luna the horse arrived at 4:30 pm to help set up the balloons. Then, Sani, the elephant came at 4:45 pm with a gift. Then both Guillermo the rat and Boberto the fish arrived at 5:05 pm.
For the party, Charles ordered 48 confetti cupcakes and another 31 cucumber cupcakes (elephants eat a lot). The cupcakes will be arriving at 6 pm. Charles wants to know how many cupcakes he will have in all for the party to make sure there will be enough.
48
31
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