What this worksheet covers
Two-digit by two-digit multiplication adds a second row of work: the first digit of the multiplier gives one partial product, the second digit gives another, and the two are added. Each problem here has two numbers from 11 to 99, stacked with room beneath for both partial products. Every answer is between 121 and 9,801, so it needs three or four digits.
Who it is for
Fourth and fifth grade. Common Core 4.NBT.B.5 asks students to multiply two two-digit numbers, and 5.NBT.B.5 expects fluency with the standard algorithm. It follows a lesson on the area model.
Multiplying two two-digit numbers · grades 4 and 5
A worked example
46 × 38. First 46 × 8 = 368. Then 46 × 30 = 1,380, which is 46 × 3 with a zero on the end. Add 368 and 1,380 to get 1,748. Estimate: 50 × 40 is 2,000, so 1,748 is close.
Mistakes to watch for
- Leaving out the placeholder zero, so the second row is the wrong size and the sum is far too small. An estimate shows it.
- Carrying into the wrong row and adding it to the wrong digit. Colored pencils for each row can help.
Make it your own
This sheet is one setting of the math worksheet generator. Open it there to change the skill, the range of numbers or the heading, or to mix several skills on one sheet.