Grade 2 – A New Video Game
Unit
Place Value Unit
Major Underlying Mathematical Concepts
Additive Property of the Base-10 Number System
Finding sums when the parts are known and differences when the whole and one part is known.
Number sense to 1,000
Addition/Subtraction
Comparison
Problem Solving Strategies
Model (manipulatives)
Table
Diagram/Key
Number line
Formal Mathematical Language and Symbolic Notation
Model
Table/Key
Number line
Total/Sum
Part/Whole
Odd/Even
Minuend/Subtrahend
Difference
Amount
Coin
Money: penny, nickel, dime, quarter, half-dollar, dollar
Money notation: ($, ¢)
Per
Tens, hundreds, thousands
Expanded notation/Standard notation
Equal share
Equivalent/Equal to
Halves, half of, one-half
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Possible Solution(s)
Yes, Austin is correct because the boys need a total of 50 more pennies to buy the video game. Or, Austin is not correct
because the boys do not need to save 25 more pennies each, but 50 pennies total.
Possible Connections
Below are some examples of mathematical connections. Your students may discover some that are not on this list.
Austin and Eli have a total of 950 pennies.
25 pennies is a quarter.
Each bag holds a dime's worth of pennies, 10¢, or 2 nickels.
100 pennies is a dollar, $1.00.
1,000 pennies is 10 dollars, $10.00.
40 quarters is 10 dollars.
Solve more than one way to verify the answer.
Relate to a similar task and state a math link.
Austin starts with more pennies (80 more).
Because Austin already has more than half of the 1,000 total pennies needed, the boys can't both give an equal share of
pennies to buy the video game.
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