What is 1000 - 123?
What is 1000 - 123?
Approach: Complement to 1000.
877. 9-1=8, 9-2=7, 10-3=7.
Follow-up: What is 1000 - 456?
Key concepts: subtraction.
What is 1000 - 123?
Approach: Complement to 1000.
877. 9-1=8, 9-2=7, 10-3=7.
Follow-up: What is 1000 - 456?
Key concepts: subtraction.