Free printable practice
Adding Whole Tens 2 Digits Missing Number Practice Activities
Grade 2 students solve missing-number addition problems by adding whole tens to two-digit numbers and using place value to find the unknown.
Practice that builds confidence
What children are practising
These Grade 2 addition worksheets help children practise equations where a two-digit number is combined with a whole ten, and one part of the equation is missing. Students learn to think in tens, not count every single one.
The printable activities include missing addends and missing sums such as 36 + __ = 56 or __ + 20 = 74. Children use place value, mental math, and simple checking strategies to complete each equation accurately.
Adding whole tens to two-digit numbers builds an important bridge between basic addition facts and flexible mental math. In this set, the unknown may appear in different positions: the missing whole-ten addend, the starting two-digit number, or the total. Children must understand that adding 10, 20, 30, and other whole tens changes the tens digit while the ones digit often stays the same.
How the skill develops
The work begins with place-value thinking: 46 + 20 means 4 tens and 6 ones plus 2 more tens. The answer is 6 tens and 6 ones, or 66. Missing-number problems ask students to reverse that thinking. If 46 + __ = 76, they compare the tens: 4 tens became 7 tens, so 3 tens were added. The missing number is 30. This helps children see addition as a relationship, not just a left-to-right procedure.
A simple parent routine
At home, read one equation aloud and ask, “What changed—the tens, the ones, or both?” Have your child underline the ones digits and circle the tens digits. Then ask them to say the answer in words: “Thirty more makes sixty-eight.” For a quick check, they can add the missing number back into the equation to see whether the total matches.
Classroom uses
Teachers can use these printables for independent practice, math centers, small-group reteaching, or morning review. They are especially useful after lessons on base-ten blocks, open number lines, or counting by tens from any number. Students can also explain one solved problem to a partner, naming the starting number, the tens added, and the total.
Common errors to watch for
Some children add to the ones digit by mistake, turning 42 + 30 into 45 or 72 + 20 into 94. Others see a blank and guess from nearby facts. Encourage the child-friendly strategy: “Keep the ones steady, move by tens.” If regrouping is not involved in the example, students should notice that the ones digit remains unchanged.
Free printable PDF download
Use this adding whole tens 2 digits 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
These worksheets keep the focus narrow: whole tens, two-digit numbers, and missing-number addition. That targeted practice lets children repeat the same idea in varied equation forms, building confidence with place value and mental addition before moving on to broader two-digit addition tasks.
Helpful answers
Frequently asked questions
What does “adding whole tens” mean in Grade 2 math?
It means adding numbers such as 10, 20, 30, or 40 to a two-digit number. Children focus on changing the tens while keeping track of the ones.
What kinds of missing numbers appear on these worksheets?
The blank may be the whole-ten addend, the starting two-digit number, or the total, such as 38 + __ = 68, __ + 20 = 57, or 45 + 30 = __.
How can my child solve 52 + __ = 82?
Have your child compare the tens digits. The number moves from 5 tens to 8 tens, which is 3 more tens. The missing number is 30.
Should students use counting on or place value for this skill?
Counting on by tens is helpful, but the goal is place-value understanding. Students should notice how many tens are added and how the ones digit is affected.
What mistake is most common with these problems?
A common mistake is changing the ones digit when only whole tens are being added. Remind students to check whether the ones digit should stay the same.
Is this adding whole tens 2 digits 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 adding whole tens 2 digits 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 adding whole tens 2 digits 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.