Educators101

Whole Tens — Missing Number Worksheets for 2nd Grade

Find the missing number when two whole tens make a total, like 40 + __ = 110. 15 free printable worksheets, each with an answer key.

Save to Pinterest

Free Whole Tens — Missing Number Worksheets

Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.

Whole Tens — Missing Number: what children learn

Missing-number problems with whole tens work like facts with ones: since 4 + 7 = 11, we know 40 + 70 = 110. Subtracting the known part from the total finds the missing part.

Whole Tens — Missing Number: worked example

40 + __ = 110 70

The total is 110 and one part is 40. 110 - 40 = 70.

Whole Tens — Missing Number: a common mistake to watch for

Kids sometimes add the two numbers they see instead of subtracting to find the missing part.

Whole Tens — Missing Number: how to help at home or in class

Play a hidden-bills game. Lay out a total in play ten-dollar bills, say 110, then slide some under a cup and show only what is left, such as 4 bills. Your child works out how many are hiding by jumping up from 40 to 110 in tens on a number line, then swaps roles and hides bills for you to guess. When they name the hidden amount at once, move on to two-digit numbers that are not whole tens.

What is on these Whole Tens — Missing Number worksheets

This set has 15 different worksheets for 2nd grade, with 21 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Find the missing number.”

Example questions like the ones on these worksheets, with their answers:

  • 20 + __ = 9070
  • 50 + __ = 9040
  • __ + 80 = 13050
  • 70 + __ = 14070
  • __ + 40 = 11070
  • __ + 10 = 7060
  • 40 + __ = 10060
  • __ + 10 = 4030

Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers

Related Addition worksheets for 2nd grade

Add Four Single-Digit Numbers
Add four one-digit numbers, such as 3 + 6 + 4 + 8.
Add Whole Tens (3 or 4 Numbers)
Add three or four numbers that are whole tens, like 30 + 40 + 20.
Add 2-Digit Numbers (No Regrouping)
Add two 2-digit numbers in columns when the ones add to less than 10.
Add 2-Digit Numbers (With Regrouping)
Add two 2-digit numbers in columns when the ones make 10 or more (sums up to 99).
Add 2-Digit Numbers — Missing Addend
Find the missing 2-digit number when the total is given.
Add a 2-Digit Number and 1-Digit Numbers
Add a 2-digit number and two or three 1-digit numbers, like 34 + 8 + 7.
All Addition worksheets
See every addition topic for 2nd grade