Lesson plan

Dimes, Dimes, Dimes

Get ready for some mental math! Help students practice subtracting by ten by solving real-world problems involving dimes.
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Students will be able to subtract multiples of 10.

(5 minutes)
  • Ask students how much a dime is worth.
  • If you have a dime (real or plastic) show it to the class.
(10 minutes)
  • Ask students how much money you would have if you had five dimes.
  • Draw five circles on the board. Write “10” in each circle. Show students how to count to 50 by tens.
  • Now ask students how much money you would have if you had 10 dimes.
  • Draw five more circles on the board and count to 100.
(10 minutes)
  • Tell students that you want to buy something that costs 30 cents. Ask how many cents you would have left if you start with 100 cents and spend 30 cents.
  • Have students turn to a partner to share their answer.
  • Now write 100 - 30 = 70 on the board.
  • Tell students that you’d like to buy either an apple for 40 cents or a pear for 30 cents.
  • Ask, “Could I buy both the apple and the pear?”
  • Have students work with their partner to figure out whether or not this would be possible.
  • Write on the board 70 - 40 - 30 = 0.
(15 minutes)
  • Pass out paper to each student. Tell them to draw a store where everything can be paid for in dimes. The prices of the items in the store should be 10 to 100 cents.
  • After students draw their stores, they should work with a partner to “purchase” items from the store.
  • Each student will start with 100 cents. As students purchase items, they should write number sentences showing how they subtracted the money they spent from 100.

Enrichment: Have students start with 200 cents when shopping in their partner’s store.

Support: Have students work with manipulatives (plastic coins) or real dimes.

(5 minutes)
  • Assess students’ understanding by observing how they are subtracting by ten.
  • Are they able to mentally subtract? Pay attention to the number sentences they write.
(5 minutes)
  • Have students share the shopping they did at their partners’ stores and the number sentences they wrote.

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