Free printable practice
Adding Whole Tens 2 Digits Missing Number Practice Activities
Printable Class 2 maths worksheets for finding missing numbers when adding whole tens to two-digit numbers.
Practice that builds confidence
Understanding the skill
These Class 2 maths worksheets help children practise adding whole tens to two-digit numbers when one number in the equation is missing. Learners build place-value understanding as they work with tens such as 10, 20, 30 and numbers like 24, 46 or 58.
The printable activities include missing sum and missing addend questions, number sentences, and place-value style practice. Children learn to notice that adding whole tens changes the tens digit while the ones digit usually stays the same in these two-digit examples.
Adding whole tens to a two-digit number is a key step in mental addition. A child may see 36 + 20 = __, __ + 30 = 67, or 42 + __ = 72. The aim is not just to count on by ones, but to understand that 20 means 2 tens. In many two-digit examples, 36 + 20 becomes 56 because 3 tens + 2 tens = 5 tens, and the 6 ones remain 6.
How the practice progresses
The worksheets move children from straightforward missing totals to questions where the missing number may be at the start or in the middle of the equation. This helps them see addition as a balanced number sentence, not only as a left-to-right calculation. Learners compare tens and ones, use known facts such as 4 tens + 3 tens = 7 tens, and connect these facts to numbers like 40, 30 and 70.
A simple parent routine
At home, ask your child to read each number sentence aloud: “46 plus what equals 76?” Then cover the ones digit and compare the tens: 4 tens to 7 tens means 3 tens, so the missing number is 30. Use coins, bundled sticks, or quick drawings of tens rods if your child needs support. After each answer, ask, “Did the ones digit change?” This builds a useful checking habit.
Classroom use for teachers
Teachers can use these printables for maths warm-ups, independent practice, small-group reteaching, or place-value centres. They also work well after a lesson on tens and ones, because the missing-number format shows whether pupils can reason about the unknown part rather than simply add the numbers shown.
Common errors to watch for
Some children add 3 instead of 30, write 46 + 30 = 49, or change the ones digit without a reason. Others treat the blank as the answer every time, even when it is the first addend. Encourage them to circle the missing part, underline the whole ten, and check whether the ones digit matches in the given two-digit numbers.
Free printable PDF download
Use this Class 2 adding whole tens missing number worksheet page to preview the activity, print it, or download it as a PDF for quick practice. It works well for homework, homeschool lessons, tutoring, morning work, revision, and classroom centers.
Answers and answer key support
After the child completes the worksheet independently, parents and teachers can use the answer support or answer key information to check the work, review mistakes, and choose the next practice step.
Why iBloom worksheets help
iBloom worksheets give focused, uncluttered practice on this exact Class 2 addition skill. The repeated but varied equations help children spot the tens pattern, strengthen mental maths, and gain confidence with missing-number addition. A child-friendly strategy is: “Look at the ones, compare the tens, then fill the blank.”
Helpful answers
Frequently asked questions
What does adding whole tens mean in these worksheets?
It means adding numbers such as 10, 20, 30 or 40 to a two-digit number. Children focus on adding tens to tens while keeping track of the ones digit.
What kinds of missing numbers will my child solve?
The blank may be the total, as in 34 + 20 = __, or a missing addend, as in 34 + __ = 64 or __ + 20 = 54.
How can I explain 47 + 30 to a Class 2 child?
Show that 47 has 4 tens and 7 ones. Adding 30 means adding 3 more tens, so 4 tens + 3 tens = 7 tens. The answer is 77.
Why does the ones digit often stay the same?
Because a whole ten has zero ones. When children add 20 or 30, they are adding tens, so in these two-digit examples the ones part usually remains unchanged.
What mistake should I look for during practice?
Watch for children adding only the tens digit as a single number, such as treating 30 as 3. Ask them to say “3 tens” to reinforce place value.
Is this Class 2 adding whole tens missing number worksheet free?
Yes. You can preview it for free and use the printable worksheet for home or classroom practice.
Can I download this Class 2 adding whole tens missing number worksheet as a PDF?
Yes. Use the worksheet download option to save a printable PDF, or print the worksheet directly from the page.
Does this Class 2 adding whole tens missing number worksheet include answers or an answer key?
When the activity has fixed answers, iBloom includes answer support so parents and teachers can check the completed worksheet.