Grade 2 · 2.NBT.1 · sheet 12 of 30
Hundreds, tens and ones
A printable worksheet, new every day, with a key that names the mistake.
- Fourteen tidy ones, with and without a zero, and six where the tens run past nine: 4 hundreds, 12 tens, 3 ones is 523.
- The key names the two usual slips: adding the digits up as if each were worth one, and writing the parts down side by side.
Hundreds, tens and ones
Write the number. Watch for tens that make another hundred.
- 1 2 hundreds, 0 tens, 6 ones
- 2 7 hundreds, 0 tens, 1 one
- 3 1 hundred, 0 tens, 4 ones
- 4 6 hundreds, 1 ten, 3 ones
- 5 7 hundreds, 8 tens, 0 ones
- 6 5 hundreds, 7 tens, 0 ones
- 7 9 hundreds, 2 tens, 5 ones
- 8 2 hundreds, 8 tens, 0 ones
- 9 4 hundreds, 6 tens, 1 one
- 10 2 hundreds, 15 tens, 8 ones
- 11 9 hundreds, 2 tens, 4 ones
- 12 5 hundreds, 8 tens, 3 ones
- 13 1 hundred, 0 tens, 8 ones
- 14 3 hundreds, 13 tens, 6 ones
- 15 1 hundred, 12 tens, 1 one
- 16 3 hundreds, 6 tens, 0 ones
- 17 3 hundreds, 9 tens, 8 ones
- 18 8 hundreds, 10 tens, 5 ones
- 19 4 hundreds, 14 tens, 0 ones
- 20 6 hundreds, 13 tens, 5 ones
The app does this live.
It picks the next problem from the last answer, skips ahead or doubles back, and animates the teaching instead of handing over a rule. Inside the app the same patterns the key names are caught as your child plays.
How to use the key
Mark the sheet against the key. Beside each answer it lists what the known mistakes would have written. One wrong answer is a slip. The same pattern three times is a rule your child is following, and the guide says what to do about it tonight.
On this sheet the key can tell apart: a digit's value is its face value (14 problems), the unit never changes when you regroup (6 problems).
Cardinal Math watches for all of these, every day.
Inside the app the same patterns are caught as your child plays, across the whole of K to grade 5, and explained to you in plain words. One price, no ads, no streaks. Coming to iPhone and iPad.
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