Grade 2Mathmedium
Addition - Block Model Practice for Grade 2
Practice addition using block models to visualize part-whole relationships with numbers up to 100
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What Your Child Will Learn
- Represent addition problems using block models to visualize how two parts combine to make a whole
- Solve addition problems with two-digit numbers (up to 100) by decomposing numbers into tens and ones using block model representations
- Apply part-whole relationship understanding to write number sentences that match block model diagrams
- Explain the connection between physical block models and abstract addition equations with numbers up to 100
How to Use This Worksheet
- Step 1: Before starting, review what the blocks represent with your child. Explain that long blocks represent groups of 10 (tens) and small squares represent single units (ones). Have them identify which is which on the worksheet.
- Step 2: For each problem, have your child look at the block model diagram and count the tens blocks first by 10s (10, 20, 30...), then count the ones blocks by 1s. They should write down both counts before adding.
- Step 3: Guide them to write the addition number sentence below the block model. For example, if the blocks show 3 tens and 4 ones plus 2 tens and 5 ones, they should write 34 + 25 = ___.
- Step 4: Have your child solve the problem by either counting all the blocks in the answer section, or by using the ten-and-ones strategy (add tens together, add ones together, then combine). Let them choose the strategy that makes sense to them.
- Step 5: Check their work by having them recount the blocks in the answer section to verify the total. This self-checking reinforces accuracy and builds independence.
Tips for Parents & Teachers
Students often struggle to connect the visual blocks to the numbers being added. Have them physically count or point to each block as they say the number aloud, rather than trying to visualize the total without touching or pointing. This bridges the gap between concrete and abstract thinking.
Watch for students who add tens and ones incorrectly (e.g., treating 20 + 3 as 23 by 'stacking' instead of understanding place value). Use the block model to emphasize that the long blocks represent groups of 10, and reinforce that we count by 10s first, then by 1s.
If a student struggles with larger sums, start by having them work through problems with smaller numbers (within 50) using the block model, then gradually increase difficulty. This prevents frustration while building confidence with the visual strategy.
Encourage students to draw their own simple block models alongside the ones on the worksheet. Hand-drawing reinforces the connection between the visual model and the numerical concept in a way that observing alone cannot achieve.
Frequently Asked Questions
Why is it important to teach addition with block models instead of just memorizing facts?
Block models help students understand WHY addition works, not just memorize answers. By seeing how tens and ones combine, children develop number sense and can solve unfamiliar problems using a strategy rather than relying on memory. This is especially important for larger numbers (up to 100) where memorization becomes impractical.
My child keeps losing track of the tens and ones when counting blocks. What can we do?
Have your child use a finger or pencil to point to each block while counting aloud. Many second graders benefit from saying 'ten, twenty, thirty' while touching each long block, then saying 'one, two, three' while touching each single square. After pointing and saying, they can write the number. This multi-sensory approach helps anchor the concept.
Is it okay if my child uses the blocks to count every single block by ones instead of counting by tens?
Yes, absolutely. Counting all blocks by ones is a valid strategy and will produce the correct answer. However, encourage (don't force) your child to try counting by tens at their own pace, as this builds efficient mental math skills. If they're successful with ones, praise that first, then gently introduce counting by tens as a 'faster way' rather than the 'right way.'
How can I tell if my child is truly understanding the concept or just guessing at answers?
Ask your child to explain their block model in their own words: 'Show me where the tens are' and 'Tell me how many ones you have.' If they can accurately identify and describe the blocks, then write the correct number sentence, they're showing understanding. If they're just writing random numbers without connecting them to the blocks, ask them to count or point to verify their answer.
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