Grade
1

Guess My Rule: How Much?

Inside the circle. The expressions 40 + 30, 90 minus 20, 60 + 10, and 7 tens. Outside the circle. The expressions 60 + 20, 70 minus 10, 5 tens, and 50 + 40.
  1. Some numbers belong in the circle, and some do not. What is the rule to be in the circle?
  2. Write at least one more example that belongs inside the circle.
  3. Write at least one more example that belongs outside the circle.
  • Make your own rule like the one above. You can use the circle below or draw your own.
  • Write some examples that belong inside your circle and some examples that belong outside your circle.
circle outline with space to write the rule for my circle
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Reference for Educators

Sample problems and solutions