Free printable practice
Adding Whole Tens 2 Digits Missing Addend Practice Activities
Class 1 worksheets for finding the missing addend in addition sums with whole tens, using tens counting, patterns, and simple number sentences.
Practice that builds confidence
What children learn
These Class 1 maths worksheets help children find the missing addend when adding whole tens within two digits, such as 20 + __ = 60 or __ + 30 = 80. Learners practise seeing tens as groups, not as isolated digits, so they can work out what must be added to reach the total.
The printable activities include number sentences with a blank in different positions, simple tens patterns, and space for children to use mental maths, counting by tens, or quick drawings of ten-sticks. They build confidence with addition facts like 10, 20, 30 ... 90 before moving to more mixed sums.
Finding a missing addend is a small but important step beyond “add and write the answer”. Children read the whole number sentence and ask, “What number is missing?” In this set, all numbers are whole tens, so 30 + __ = 70 is treated as 3 tens + __ = 7 tens. This keeps the focus on place value and addition relationships.
How the practice progresses
The worksheets move from easier blanks after the plus sign to blanks at the beginning of the sum. Children may first solve 20 + __ = 50 by counting 30, 40, 50 and noticing that 3 jumps of ten were needed. Later, they meet __ + 40 = 90 and learn that the missing part can come before the known addend. Repeated exposure helps them connect addition with the idea of “how much more”.
A simple home routine
Ask your child to circle the total first, then underline the given addend. Say the sum aloud: “20 plus what makes 60?” Let them count on using fingers for tens, ten-rupee style groups, or a quick row of ten-sticks. After solving, have them read the complete equation: “20 + 40 = 60.” This short routine builds accuracy and mathematical language.
Classroom uses
Teachers can use these printables for morning maths practice, addition revision, small-group support, or maths centres. They also work well after place value lessons on tens and ones. For peer discussion, ask children to explain whether they counted on by tens, used a number line, or compared the number of tens in the addend and total.
Common mistakes to watch for
Some children write the total in the blank because they see an empty space and rush. Others count by ones instead of tens, which is slow and can lead to errors. A few may compare only the first digit without saying the number aloud, confusing 6 tens with the number 6. Encourage them to use full tens words: twenty, thirty, forty, and so on.
Free printable PDF download
Use this Class 1 adding whole tens missing addend 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
The activities are focused only on missing addends with whole tens, so children get enough repeated practice without distraction. Clear layouts, familiar two-digit tens, and varied blank positions help Class 1 learners build fluency, place value understanding, and confidence before attempting missing addends with mixed two-digit numbers.
Helpful answers
Frequently asked questions
What does “missing addend” mean in these worksheets?
It means one part of an addition sum is blank. For example, in 30 + __ = 70, the child has to find the number that must be added to 30 to make 70.
Are these worksheets only for whole tens?
Yes. The practice focuses on numbers such as 10, 20, 30, 40, and so on, so Class 1 children can use tens patterns before working with mixed two-digit numbers.
How should my child solve 20 + __ = 60?
Encourage your child to count on by tens from 20: 30, 40, 50, 60. Since four tens were added, the missing addend is 40.
Why are blanks sometimes at the beginning of the sum?
Blanks in different positions help children understand the full addition relationship. __ + 30 = 80 still asks what part is needed to make the total 80.
What should I do if my child writes the answer total in the blank?
Ask them to read the equation aloud and point to the total after the equals sign. Then ask, “What number joins with the given addend to make this total?”
Is this Class 1 adding whole tens missing addend worksheet free?
Yes. You can preview it for free and use the printable worksheet for home or classroom practice.
Can I download this Class 1 adding whole tens missing addend 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 1 adding whole tens missing addend 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.