Mixed rounding (10s, 100s) Worksheets

These rounding numbers worksheets are designed for 3rd Grade students (Ages 8-9). Print any one in the set for targeted practice, or download them together as a packet.

Yes. These worksheets work for homeschool, classroom, and tutoring. Use them as a morning warm-up, an independent center activity, or a fast-finisher task.

Third graders should round whole numbers to the nearest 10 and the nearest 100 (CCSS 3.NBT.A.1). They should understand that rounding means finding the closest benchmark number and that the midpoint (like 5 in the ones place or 50 in the tens place) rounds up by convention. Students should apply rounding to estimate sums and differences before computing exact answers. They should also explain their rounding using a number line or place value reasoning, not just follow a memorized rule. Worksheets that present rounding problems alongside number lines, then gradually remove the visual support, help children transition from concrete understanding to mental rounding. Practice with both "round to the nearest 10" and "round to the nearest 100" using the same number builds flexibility.

The most common error is changing the wrong digit. When rounding 347 to the nearest 10, some children write 300 instead of 350 because they round to the nearest hundred by mistake. Another frequent error is rounding up when the key digit is below 5. Children also sometimes change the digit being rounded without adjusting the digits to its right to zeros. For example, rounding 682 to the nearest 100 and writing 782 instead of 700. Worksheets that require students to first underline the place they are rounding to, then circle the digit to the right of it, and finally apply the rounding rule step by step help prevent these errors. Consistent use of number lines as a checking strategy also reduces mistakes.

Use a number line approach first: to round 43 to the nearest 10, find 43 on a number line between 40 and 50. Since 43 is closer to 40, it rounds down. For 47, it is closer to 50, so it rounds up. Then introduce the shortcut: look at the digit to the right of the place you are rounding to. If it is 0 through 4, the rounding digit stays the same (round down). If it is 5 through 9, the rounding digit goes up by one (round up). All digits to the right become zeros. Worksheets that start with number line problems and progress to rule-based problems help children connect the visual understanding to the procedure. Always have students verify their rounded answer by checking that it is the closer benchmark.