Grade
1

Guess My Rule: What's the Amount?

Inside the circle: 60 minus 10. 30 + 20. 49 + 1. 5 tens. Outside the circle: 50 minus 30. 80 minus 20. 20 + 3. 4 tens.
  1. Some numbers belong in the circle, and some do not. What is the rule to decide what can 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, using addition and subtraction. 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.

A circle, with the heading 'Rule for my circle.'
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