Grade
2

Guess My Rule: Exploring Digits

Inside the circle: 111 in base ten pieces. 6 trains of Unifix cubes with 6 single cubes. The number 777. The expression 400 + 40 + 4. The number 55. Outside the circle: 134 in base ten pieces. The expression 400 + 70 + 2, the number 246. 244 in base pieces. 3 hundreds, 5 tens, 7 ones. The number 87.
  1. Some things belong in the circle, and some things do not. What is the rule to be in the circle?
  2. Which of these belong inside of the circle? Circle them. How do you know? (Hint: Look at the digits in each number!)
Choose from these: 6 hundreds, 2 tens, 4 ones. 333 in base ten pieces. The expression 500 + 50 + 5.
  1. Draw or make at least one more example that belongs inside the circle. Describe why it belongs there.
  2. Write or draw at least one more example that belongs outside the circle. Describe why it belongs there.

Make your own rule, using place value. You can use the circle below or draw your own.

Write or draw some examples that belong inside your circle and some examples that belong outside your circle.

An empty circle, with the heading 'Rule for my circle.'
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Reference for Educators

Sample problems and solutions