Home/Second Grade Math/Lesson 146
K-5 friendly lesson
One small step at a time.Read the idea, try the activity, and celebrate each win as you go.

How Much More To Make a Dollar?

πŸ’΅ The Race to 100! A Dollar is exactly 100 cents. If you have 80 cents, what is missing to reach the top?

Do this: Read the concept below, then try the quiz or activity.

Lesson 146 of 186

Concept

This is exactly the same as the "Missing Addition Piece" algebra we learned, just specifically targeting the number 100!

🎯 The Dollar Target:
Problem: What do I add to 65Β’ to make $1.00?
1. Remember the math translation: $1.00 = 100.
2. The Missing Piece strategy: Total (100) minus Start (65).
3. Stack it: 
  1 0 0
-   6 5
---------
   (Borrow across the zeroes!). 10 - 5 = 5.    (The first 0 became a 9). 9 - 6 = 3.
4. Answer: 35Β’!

Let's double check: 65 + 35 = 100. Perfect!

Try it

Finish the dollar!

Instructions: Subtract your current money from 100 to find out how much more you need.

Problem 1: You have 80Β’. How much more do you need? * 100 - 80 = ? * (Hint: Use your ten dials! 100 down to 90, 90 down to 80). * Answer: ___Β’.

Problem 2: You have a Quarter (25Β’). How much more to make $1.00? * 100 - 25 = ? * (Hint: Count Quarters backward! $1.00 -> 75!). * Answer: ___Β’.

Problem 3: You have 50Β’. * Answer: ___Β’.

Problem 4: You have 91Β’. * (Count up! 91 + __ = 100?) * Answer: ___Β’.

Complete & Continue β†’