CCSS 1.OA.D.8 Worksheets
Grade 1 · Operations & Algebraic Thinking
Find the missing whole number in an addition or subtraction equation involving three numbers.
Below are free printable worksheets that support 1.OA.D.8. Print them as PDFs, or generate a fresh one. Every math answer key is computed in code, so it is never wrong.
Teaching guide
What students learn
Find the missing whole number in an addition or subtraction equation involving three numbers.
How to teach it
Show pairs that make a target (all the ways to make 10) with counters split into two parts, then record as facts. Learn bonds to 10 by heart.
Worked example
4 + ___ = 10
Answer: 6
Generated and checked in code, so it is correct.
Watch out for
Treating each fact as separate rather than using the commutative link (3 + 7 and 7 + 3).
Number Bonds worksheets
All number bonds worksheets →Kindergarten Number Bonds
Set A · printable PDF · answer key
Kindergarten Number Bonds
Set B · printable PDF · answer key
Kindergarten Number Bonds
Set C · printable PDF · answer key
Kindergarten Number Bonds
Set D · printable PDF · answer key
Kindergarten Number Bonds
Set E · printable PDF · answer key
Kindergarten Number Bonds
Set F · printable PDF · answer key
Addition worksheets
All addition worksheets →Subtraction worksheets
All subtraction worksheets →Pre-K Subtraction
Set A · printable PDF · answer key
Pre-K Subtraction
Set B · printable PDF · answer key
Pre-K Subtraction
Set C · printable PDF · answer key
Pre-K Subtraction
Set D · printable PDF · answer key
Pre-K Subtraction
Set E · printable PDF · answer key
Pre-K Subtraction
Set F · printable PDF · answer key