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demonstrate and describe the processes of addition and subtraction of whole numbers up to 1000 with and without regrouping, using manipulatives, diagrams, and symbols
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Paul and Gilbert are using a pair of dice and base-ten blocks to play "Race to 1000." The gameboards show their total score, represented by blocks. What is each boy's score in numbers?
Paul
Gilbert
Each time they have a turn, the boys must show the new total, using the fewest blocks possible. On their next turn Paul rolls four 10s (1st die) and six 1s (2nd die). Gilbert rolls six 10s and three 1s. How will the gameboard look now? Write each boy's score in numbers.
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explore and demonstrate the processes of multiplication and division up to 50, using manipulatives, diagrams, and symbols
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Mom bought three packages of muffins. Each package held one dozen muffins. She repackaged the muffins before freezing them. Each freezer bag held three muffins. How many freezer bags did Mom use? Act out this story problem with counters. Write a number sentence to match this story.
Make up your own two-step problem. Draw a picture to show the story and its solution.
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recall addition and subtraction facts up to 18 and multiplication facts up to 25
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Use the following grids to do addition and multiplication.
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calculate and justify the methods they used to find sums, differences, products, and quotients using estimation strategies, mental math techniques, manipulatives, algorithms, and calculators
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If you bought all the items pictured below, how much would it cost you? Estimate the answer.
Arnie and Cindy estimated the cost as follows:
| Arnie | Cindy |
2 x $3 = $6
6 x $1 = $6
_________
$12 |
2 x $3 = $6
2 x $1.50 = $3
2 x $1.50 = $3
2 x $1.50 = $3
____________
$15
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Explain each one's strategy. Which strategy would you use? Why?
Use a calculator to find the exact cost. Which estimation strategies produced a closer solution? Why?
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verify their solutions to problems by using inverse operations, estimation, and calculators
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Amy says she corrects her own calculations by adding to check her subtraction and subtracting to check her addition. She says 264 added to 727 is 991, and 369 subtracted from 806 is 447. Use Amy's strategy to check her work. Do you think Amy's arithmetic is correct? Explain. Redo any arithmetic that is incorrect.
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Number (Number Operations)
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