Worked examples
Two examples
Example 1
236 × 7 =
- Ones: 7 × 6 = 42; write 2, carry 4.
- Tens: 7 × 3 = 21, plus 4 carried = 25; write 5, carry 2.
- Hundreds: 7 × 2 = 14, plus 2 carried = 16; write 16.
Answer: 1,652
Example 2
1,408 × 6 =
- Ones: 6 × 8 = 48; write 8, carry 4. Tens: 6 × 0 = 0, plus 4 = 4; write 4.
- Hundreds: 6 × 4 = 24; write 4, carry 2. Thousands: 6 × 1 = 6, plus 2 = 8.
Answer: 8,448
Where this is taught: Quiz 4: Multi-Digit Multiplication, “One digit at a time, carries riding along”
The drill
Ten problems
How many:
Type each answer, then press Check my answers at the bottom. Commas in large numbers are fine.Write each answer on the line. The answer key, with the reasoning, is on the last page.