DrillGrades 1 to 2Grades 3 to 4
Addition worksheets
Printable addition practice with control over digits, regrouping and layout.
Estimating sums and differences worksheets
Estimate sums and differences by rounding each number first, to the nearest 10, 100, 1,000 or 10,000.
About this worksheet
Each problem is a sum or a difference. Students round both numbers to the chosen place, then add or subtract the rounded numbers to get an estimate. By default there is a box for each rounded number, which keeps the steps visible; turn the boxes off to practice doing the rounding in your head.
Choose addition, subtraction or a mix, the place to round to, and how many extra digits make the numbers longer. Numbers that are exactly halfway are never used, and differences are always positive. Every sheet has a solved example and an answer key, and there is a large-print version.
Printing
US Letter or A4, portrait: choose your paper size above. Print at 100 percent (actual size). Use "Black and white" for the copier, or "Color" for display pages and mini books.
Popular versions
Ready-made settings for common topics.
- Estimating sums by rounding to the nearest 10 worksheets
- Estimating differences by rounding to the nearest 10 worksheets
- Estimating differences by rounding to the nearest 100 worksheets
- Estimating sums and differences to the nearest 100 worksheets
- Estimating sums by rounding to the nearest 1,000 worksheets
- Estimating differences by rounding to the nearest 1,000 worksheets
- Estimating sums by rounding to the nearest 10,000 worksheets
- Estimating sums by rounding in your head worksheets
- Estimating sums of four-digit numbers to the nearest 100 worksheets
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