Complete a Teen Model with a Missing Ten
Draw the extra ones and leave an empty group-circle.
About 12 minutes, plus any extended practice
Supplied materials
- Paper and a pencil; drawing and spoken explanations are welcome. An adult may read directions and options aloud.
- Supplied worked-case record: The whole is 14 and four extras are already drawn.
- All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.
Learn the idea
Sometimes the extra ones and the teen total are shown, but the full group is missing. A teen model needs exactly ten in its first group. Checking the total helps you see that the missing group is not just one mark.
Draw the extra ones and leave an empty group-circle. Add enough marks inside the circle to make the stated teen total. Count the circle’s marks, then recount the entire model.
A group of ten contains ten actual marks. The 1 in the teen numeral is not a count of one total object. Draw the full-ten group as a circle that can hold ten marks.
- Draw the full-ten group as a circle that can hold ten marks.
- Follow the worked example. Point to each number or shape feature and say what it tells you.
- Draw the extra ones and leave an empty group-circle.
- Try the question and then the three practice questions. Check your answers and explain any change you make.
See the method in action
The whole is 14 and four extras are already drawn. Ten marks must go in the empty group because 10 + 4 = 14. Adding only one mark would make five total marks, so the group labeled ten must really contain ten. A group of ten contains ten actual marks. The 1 in the teen numeral is not a count of one total object. Draw the full-ten group as a circle that can hold ten marks.
Check your reasoning
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Helpful tips
- A group of ten contains ten actual marks.
- The 1 in the teen numeral is not a count of one total object.
See the answer and explanation
10
A teen number is ten and the stated extra ones. The result is 10.
Take it further
Complete 18 with eight extras shown. Expected: ten marks in the full group.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
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Check the subject sources
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