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Subtract a 1-digit number from a 2-digit number without regrouping

The learner understands that subtracting a one-digit number from a two-digit number without regrouping removes part of the ones place while leaving the tens place unchanged because the minuend’s ones digit is at least as large as the number subtracted. Place-value representations and number lines show the relationship between the original quantity, the amount removed, and the difference; cases requiring composing a ten, larger numbers, and generalized subtraction algorithms are not included.

Detailed Explanation: Subtract a 1-digit number from a 2-digit number without regrouping

To subtract a 1-digit number from a 2-digit number without regrouping:

  1. Look at the ones digits.
  2. Subtract the 1-digit number from the ones digit.
  3. Keep the tens digit the same.

Example: 36−436-4

Write 3636 as 33 tens and 66 ones:

36=30+636=30+6

Subtract 44 ones from 66 ones:

6−4=26-4=2

The 33 tens stay the same, so:

30+2=3230+2=32

Therefore,

36−4=3236-4=\boxed{32}

You can also count back 4 on a number line:

36→35→34→33→3236\rightarrow35\rightarrow34\rightarrow33\rightarrow32

So, the answer is 32\boxed{32}.

Learn by doing: Subtract a 1-digit number from a 2-digit number without regrouping

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    Subtraction - Whole Number 2 x 1 - Columns, No Borrow

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