Workbook Detail
Fact Family Add Sub Within 20 Hard — Set 8
Exercise 1
- OperationPair
- add-sub
- Triple
- 6
- 6
- 12
- Mode
- write_all
- Equations
- {"text":"6 + 6 = 12","parts":[6,"+",6,"=",12]}
- {"text":"12 - 6 = 6","parts":[12,"-",6,"=",6]}
Exercise 2
- OperationPair
- add-sub
- Triple
- 8
- 1
- 9
- Mode
- write_all
- Equations
- {"text":"8 + 1 = 9","parts":[8,"+",1,"=",9]}
- {"text":"1 + 8 = 9","parts":[1,"+",8,"=",9]}
- {"text":"9 - 8 = 1","parts":[9,"-",8,"=",1]}
- {"text":"9 - 1 = 8","parts":[9,"-",1,"=",8]}
Exercise 3
- OperationPair
- add-sub
- Triple
- 10
- 4
- 14
- Mode
- write_all
- Equations
- {"text":"10 + 4 = 14","parts":[10,"+",4,"=",14]}
- {"text":"4 + 10 = 14","parts":[4,"+",10,"=",14]}
- {"text":"14 - 10 = 4","parts":[14,"-",10,"=",4]}
- {"text":"14 - 4 = 10","parts":[14,"-",4,"=",10]}
Exercise 4
- OperationPair
- add-sub
- Triple
- 3
- 3
- 6
- Mode
- write_all
- Equations
- {"text":"3 + 3 = 6","parts":[3,"+",3,"=",6]}
- {"text":"6 - 3 = 3","parts":[6,"-",3,"=",3]}
Exercise 5
- OperationPair
- add-sub
- Triple
- 6
- 4
- 10
- Mode
- write_all
- Equations
- {"text":"6 + 4 = 10","parts":[6,"+",4,"=",10]}
- {"text":"4 + 6 = 10","parts":[4,"+",6,"=",10]}
- {"text":"10 - 6 = 4","parts":[10,"-",6,"=",4]}
- {"text":"10 - 4 = 6","parts":[10,"-",4,"=",6]}
Exercise 6
- OperationPair
- add-sub
- Triple
- 1
- 9
- 10
- Mode
- write_all
- Equations
- {"text":"1 + 9 = 10","parts":[1,"+",9,"=",10]}
- {"text":"9 + 1 = 10","parts":[9,"+",1,"=",10]}
- {"text":"10 - 1 = 9","parts":[10,"-",1,"=",9]}
- {"text":"10 - 9 = 1","parts":[10,"-",9,"=",1]}
Teaching Notes
Practice fact family add sub within 20 with free printable worksheets. Uniquely generated — reinforce key math skills with every set.
Frequently Asked Questions
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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.
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