Workbook Detail
Fact Family Add Sub Within 20 Fill Blanks — Set 8
Exercise 1
- OperationPair
- add-sub
- Triple
- 4
- 16
- 20
- Mode
- fill_blanks
- Equations
- {"display":"4 + 16 = __","blank":20,"blankPosition":4,"originalParts":[4,"+",16,"=",20]}
- {"display":"16 + 4 = __","blank":20,"blankPosition":4,"originalParts":[16,"+",4,"=",20]}
- {"display":"20 - 4 = __","blank":16,"blankPosition":4,"originalParts":[20,"-",4,"=",16]}
- {"display":"__ - 16 = 4","blank":20,"blankPosition":0,"originalParts":[20,"-",16,"=",4]}
Exercise 2
- OperationPair
- add-sub
- Triple
- 6
- 19
- 25
- Mode
- fill_blanks
- Equations
- {"display":"6 + 19 = __","blank":25,"blankPosition":4,"originalParts":[6,"+",19,"=",25]}
- {"display":"__ + 6 = 25","blank":19,"blankPosition":0,"originalParts":[19,"+",6,"=",25]}
- {"display":"25 - __ = 19","blank":6,"blankPosition":2,"originalParts":[25,"-",6,"=",19]}
- {"display":"__ - 19 = 6","blank":25,"blankPosition":0,"originalParts":[25,"-",19,"=",6]}
Exercise 3
- OperationPair
- add-sub
- Triple
- 12
- 12
- 24
- Mode
- fill_blanks
- Equations
- {"display":"12 + 12 = __","blank":24,"blankPosition":4,"originalParts":[12,"+",12,"=",24]}
- {"display":"24 - 12 = __","blank":12,"blankPosition":4,"originalParts":[24,"-",12,"=",12]}
Exercise 4
- OperationPair
- add-sub
- Triple
- 11
- 11
- 22
- Mode
- fill_blanks
- Equations
- {"display":"__ + 11 = 22","blank":11,"blankPosition":0,"originalParts":[11,"+",11,"=",22]}
- {"display":"22 - __ = 11","blank":11,"blankPosition":2,"originalParts":[22,"-",11,"=",11]}
Exercise 5
- OperationPair
- add-sub
- Triple
- 14
- 7
- 21
- Mode
- fill_blanks
- Equations
- {"display":"14 + 7 = __","blank":21,"blankPosition":4,"originalParts":[14,"+",7,"=",21]}
- {"display":"7 + __ = 21","blank":14,"blankPosition":2,"originalParts":[7,"+",14,"=",21]}
- {"display":"21 - __ = 7","blank":14,"blankPosition":2,"originalParts":[21,"-",14,"=",7]}
- {"display":"21 - 7 = __","blank":14,"blankPosition":4,"originalParts":[21,"-",7,"=",14]}
Exercise 6
- OperationPair
- add-sub
- Triple
- 9
- 12
- 21
- Mode
- fill_blanks
- Equations
- {"display":"9 + __ = 21","blank":12,"blankPosition":2,"originalParts":[9,"+",12,"=",21]}
- {"display":"__ + 9 = 21","blank":12,"blankPosition":0,"originalParts":[12,"+",9,"=",21]}
- {"display":"21 - 9 = __","blank":12,"blankPosition":4,"originalParts":[21,"-",9,"=",12]}
- {"display":"21 - 12 = __","blank":9,"blankPosition":4,"originalParts":[21,"-",12,"=",9]}
Teaching Notes
Download this free fact family add sub within 20 fill blanks math worksheet. Uniquely generated with an answer key — great for homework, practice, or assessment.
Frequently Asked Questions
How do I use this Fact Family Add Sub Within 20 Fill Blanks Math Worksheet worksheet?
Print the worksheet and complete the problems. Each set number generates a unique arrangement. Use the same set number for all students in a class for consistent assessment.
Is there an answer key?
Yes — every worksheet includes a complete answer key. Print it separately or view it on screen.