Write 4 tens and 7 ones as a number.
Incorrect answer: 11
The 3 in 34 means 30, not 3. Zero also has a job: it holds a place when that position has no units.
Adding digits instead of their place values
A digit in the tens place represents groups of ten. Its value changes when it moves to another place.
The correction
47
40 + 7 = 47.
- Group objects into bundles of ten.
- Count the tens first, then the unbundled ones.
- Write the number as tens plus ones and connect it to the two digits.
Try the reasoning in another example
How many tens and ones are in 60?
- The digit 6 is in the tens place.
- The zero shows there are no leftover ones.
Answer: 6 tens and 0 ones
Explain why each step preserves the quantity or relationship. If you can compute the answer but cannot explain the step, revisit the model before adding more questions.
The short check below reuses the first example as a retrieval question and adds a second question. It checks this method; it does not establish a grade level.
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