Skill: Divide a 2-digit dividend by a 1-digit divisor

To divide a 2-digit number by a 1-digit number, use place value: divide the tens first, then the ones.

Example: $87 \div 4$

1. Divide the tens.
   $87$ has $8$ tens and $7$ ones.
   Divide the $8$ tens into $4$ equal groups:

$$8 \div 4 = 2$$

Write $2$ in the tens place of the quotient.

2. Divide the ones.
   There are $7$ ones left. Divide them into $4$ equal groups:

$$7 \div 4 = 1\text{ remainder }3$$

Write $1$ in the ones place. The remainder is $3$.

3. State the answer.

$$87 \div 4 = 21\text{ R}3$$

This means each of $4$ groups gets $21$, with $3$ left over. The remainder must be less than the divisor, and $3<4$.

4. Check your work.
   Multiply the quotient by the divisor, then add the remainder:

$$21 \times 4 + 3 = 84+3=87$$

Since the result is $87$, the division is correct.