About This Worksheet
This worksheet helps sixth-grade students use estimation to judge the size of decimal answers before solving exactly. Students look at decimal expressions, choose the most reasonable estimate from several answer choices, and then complete the calculation to check their thinking. The problems include addition, subtraction, multiplication, and division. This makes the page a strong way to build number sense alongside computation.
What Students Practice
Students round decimal values and estimate the result of mixed-operation expressions. After choosing the most reasonable estimate, they solve the original problem exactly to see how close their estimate was. The answer choices require students to think about magnitude instead of simply guessing. This gives them practice with rounding, mental math, decimal operations, and reasonableness all at once.
Why This Matters
Estimation is one of the best ways students can check their own decimal work. A misplaced decimal point can make an answer ten or even one hundred times too large or too small, and an estimate can reveal that quickly. Students who estimate regularly are more likely to notice answers that do not make sense. This builds stronger mathematical independence and confidence.
Teaching Tips
Encourage students to round each decimal to a friendly number before looking at the answer choices. Remind them that an estimate does not have to match the exact answer, but it should be reasonably close. After solving exactly, ask students to compare the two values and explain why the estimate was useful. If they choose an unreasonable option, have them talk through the approximate size of each number before recalculating.
Curriculum Standards
This worksheet reinforces CCSS.MATH.CONTENT.6.NS.B.3 through practice with addition, subtraction, multiplication, and division of decimals. Although estimation itself is used as a supporting skill, it strengthens the reasonableness checks students need when applying the standard algorithm. The worksheet is useful for review, intervention, test preparation, or building stronger number sense during a Grade 6 decimal unit.