Adding 10s and 20s Worksheets

About This Worksheet Collection

The Adding 10s and 20s Worksheets collection helps students understand how adding multiples of ten affects numbers in predictable, place-value-based ways. By practicing with +10 and +20 in both vertical and horizontal formats-and across two- and three-digit numbers-students see clearly that these operations mostly change the tens digit while leaving the ones digit the same. That insight turns "big" numbers into friendlier, pattern-based problems rather than memorization tasks.

Across the collection, learners work within 100 and within 1,000, strengthening mental math strategies, vertical alignment skills, and number sense. Place-value grids and expanded formats provide extra visual support for students who need it, while straightforward horizontal problems push others toward efficient mental computation. Together, these worksheets build fluency, confidence, and flexibility with adding tens and twenties-crucial groundwork for multi-digit addition, subtraction, and later algorithms.

Detailed Descriptions Of These Worksheets

Add Ten Practice
Students add ten to a wide range of two-digit numbers using vertical equations with answer boxes. As they solve, they see that adding ten increases the tens digit by one while the ones digit stays the same. This repeated pattern reinforces core place-value understanding and builds fluency within 100. The clean format supports independent practice and accuracy.

Add Twenty Practice
Learners add twenty to two-digit numbers in vertical format. They observe that the tens digit increases by two, deepening their understanding of how adding multiples of ten affects only the tens place in most cases. The repeated practice strengthens mental strategies for tens and builds confidence with addition within 100. The structured layout helps maintain neat alignment.

Add Ten to Larger Numbers
Students add ten to two- and three-digit numbers using vertical equations. Because many addends are over 100, learners must apply place-value thinking beyond simple tens and ones. Repeated problems help them see that adding ten shifts the tens place even when numbers extend into the hundreds. This worksheet prepares students for more complex multi-digit addition.

Add Twenty to Larger Numbers
This worksheet has students add twenty to two- and three-digit numbers, often involving values in the hundreds. Learners practice tracking how the tens and hundreds places change when adding a multiple of ten. The vertical layout reinforces alignment and regrouping when needed. It builds confidence with addition within 1,000 and strengthens base-ten reasoning.

Tens Addition Application
Students solve horizontal equations that require adding ten to two- and three-digit numbers. Without vertical alignment, they are encouraged to use mental math strategies, such as visualizing jumps of ten on a number line. This practice deepens understanding of place value and helps students become more efficient at adjusting numbers by ten. It's ideal for fluency building and quick reviews.

Add Twenty Horizontal
Learners add twenty to numbers of varying sizes using horizontal equations. They practice mentally adjusting the tens digit by two while maintaining the ones digit. The consistent structure helps them recognize predictable patterns in the base-ten system. This worksheet supports addition within 1,000 and strengthens mental math accuracy and speed.

Vertical Add Ten
Students add ten to two-digit numbers in a vertical layout with structured boxes for digits. The clear alignment reinforces proper place-value placement and makes it easy to see how only the tens digit changes. Through repeated practice, students gain fluency and automaticity with adding ten. This worksheet lays a solid foundation for more advanced vertical computation.

Vertical Add Twenty
This worksheet provides vertical practice adding twenty to two-digit numbers, supported by a place-value grid. Students visually track how the tens digit increases by two, reinforcing base-ten patterns. The format helps learners organize their work and compute accurately. Regular practice strengthens number sense and prepares students for more complex multi-digit problems.

Horizontal Ten Addition
Students work on horizontal equations that involve adding ten to two-digit numbers. They focus on quick mental adjustments to the tens digit, reinforcing fluency and confidence. The simple layout encourages efficient solving without relying on vertical stacking. This worksheet is especially useful as a warm-up or timed practice for mental math with tens.

Horizontal Twenty Addition
Learners add twenty to different two-digit numbers in horizontal format. The problems are designed to promote mental computation and recognition of tens-based patterns. As students repeatedly adjust the tens place, they become more comfortable and accurate with adding multiples of ten. The page is perfect for assessment, independent practice, or review.

Vertical Ten Addition (Grid)
Students add ten to multi-digit numbers using a clear place-value grid in vertical format. The grid supports precise alignment of ones and tens and visually reinforces how adding ten affects the tens column. Problems include numbers between about 70 and 140, helping learners generalize the pattern across ranges. This worksheet builds fluency and early multi-digit addition skills.

Vertical Twenty Addition (Grid)
This worksheet has students add twenty to multi-digit numbers using a place-value grid. They observe that the tens digit increases by two, while the ones digit remains unchanged. The structured format solidifies understanding of base-ten patterns and vertical organization. Repeated practice improves accuracy and confidence with adding multiples of ten.

Add Ten (Expanded Format)
Students add ten to two- and three-digit numbers using an expanded vertical grid that highlights place-value positions. The layout emphasizes that the tens place is the one that changes when adding ten. Numbers span several ranges (20s, 80s, 100s, etc.), encouraging flexible thinking about place value. This worksheet supports addition within 1,000 and strong vertical organization.

Add Twenty (Expanded Format)
Learners practice adding twenty to two- and three-digit numbers using a similar expanded vertical grid. They solidify the idea that adding twenty shifts the tens place by two increments. The variety of starting numbers fosters flexible application of the rule. This worksheet deepens both base-ten understanding and multi-digit addition fluency.

Mixed Ten Addition Set
Students complete a large set of vertical problems where ten is added to many different two-digit numbers. Each equation reinforces the pattern that the tens digit rises by one while the ones digit remains constant. The repeated, predictable structure builds speed, accuracy, and confidence. This page works well for practice, review, or quick assessment of skills related to adding multiples of ten.