Benchmark Instructional Guide
Connecting Benchmarks/Horizontal Alignment
Terms from the K-12 Glossary
Purpose and Instructional Strategies
The purpose of this benchmark is to connect money concepts to adding and subtracting decimals. This benchmark can be taught in tandem with the addition and subtraction of decimals to the hundredths (MA.4.NSO.2.7
). Students solve problems within a real-world context using money (MTR.7.1
- For instruction, students should have opportunities using multiplication to count collections of coins (e.g., How much money is 50 nickels?).
- When students solve problems, invite flexible strategies that students learned with whole number addition and subtraction. For example, when finding the change for $2.00 on an item that costs $1.84, students may count up $0.16 instead of subtracting $2.00 - $1.84.
- Students need to understand how different coins and bills relate to each other.
Common Misconceptions or Errors
- Students can add and subtract incorrectly when they do not add or subtract like place values.
Strategies to Support Tiered Instruction
- Instruction includes connecting place value to addition and subtraction of whole numbers, utilizing place value charts so that students can see where to line up values for the computation.
- For example, $20.20 – $9.75 is going to require some regrouping. By placing the problem in a place value chart, students can line up the decimal and subtract like place values.
- Instruction includes relating decimal place values. Working with base ten blocks, students can build decimals and their equivalents.
- For example, building 0.2 “two tenths” and 0.20 “twenty hundredths” with base ten blocks. Students will notice that the numbers have the same value.
Instructional Task 1
Jordan was saving his money to buy a remote control motorcycle. He saved $45.00 from his allowance and received two checks worth $10.00 each for his birthday. Jordan also has a half dollar coin collection with 30 coins in it. If the motorcycle costs $73.00, does Jordan have enough money to buy the motorcycle?
Instructional Item 1
Maria went to the comic bookstore and bought a comic book for $5.34 and a comic book for $9.55. If she paid with a $20 bill, how much change would she get back? *The strategies, tasks and items included in the B1G-M are examples and should not be considered comprehensive.