Is It Reasonable
Each student solved a problem. Round to estimate the answer. Then circle whether their answer is reasonable.
Fresh sheet anytime. Tap New sheet or reload for a different one. Tap + for up to 10.
This is sheet #176724601.
How to do it
- Round each number to estimate the answer.
- Compare the estimate with the student's answer.
- Circle reasonable or not reasonable.
Teaching tip
An answer that's about 10 times too big or too small usually means a 0 was added or left out. This sheet is aligned with Common Core 5.NBT.B.5.
About this worksheet
Students' answers to check by estimating, some right and some way off. Fewer has 4, Standard has 5 and More has 6. Includes an answer key.
What kids practice
Fifth graders multiply bigger whole numbers with the standard algorithm, like 427 × 36 or 243 × 152. Each digit of the bottom number makes its own row, with a 0 for the tens row and two 0s for the hundreds row, and then the rows are added. The goal by the end of 5th grade is to do this accurately and without needing an area model, and to estimate to check that an answer makes sense.
Watch for
- Forgetting the 0 in the ones place for the tens row, or the two 0s for the hundreds row.
- Adding a carry from the first row into the second row.
- Lining up a row in the wrong columns.
- Adding the rows wrong after all the multiplying is right.
It's free to print, with Fewer, Standard or More on the page and an answer key. See the full multi-digit multiplication guide for 5th grade.
More sheets in this set
- See it all
1. How to Multiply 3-Digit by 2-Digit427 × 36 worked on graph paper with each step explained, an estimate to check, and why the 0 goes in the ones place. 
2. 3-Digit by 2-Digit3-digit by 2-digit multiplication on graph paper, with shaded rows for the two partial products and the answer. Fewer has 4 problems, Standard has 6 and More has 9.
3. 4-Digit by 2-Digit4-digit by 2-digit multiplication on graph paper. Fewer has 4 problems, Standard has 6 and More has 9.- See it all
4. How to Multiply by a 3-Digit Number243 × 152 worked on graph paper with three rows, plus how many zeros each row needs and what to do when the middle digit is 0. 
5. 3-Digit by 3-Digit3-digit by 3-digit multiplication on graph paper, with shaded rows for the three partial products and the answer. Fewer has 4 problems, Standard has 6 and More has 9.
6. Find the MistakeWorked problems with one mistake each, like a missing 0, a carry left out or rows added wrong, next to an empty grid to fix it. Fewer has 2 problems, Standard has 3 and More has 4. The answer key circles the mistake, names it and shows the correct work.
8. Missing DigitsFinished multiplication problems with some digits missing, each with exactly one answer. Fewer has 4 problems with 2-digit numbers, Standard has 6 and More has 6 with more blanks. Includes an answer key.
9. Multiplication Word ProblemsMulti-step word problems that use multiplying large numbers with adding or subtracting. Fewer has 3, Standard has 4 and More has 5. Includes an answer key.