Subtract the following and verify your answers by suitable addition.
21357-11257
21357-1125710100
Check 11257+1010021357
Perform the following subtractions. Check your answers by the corresponding additions.
8940-1094
400000-79876
9876-7856
42786-40589
Looking at the following addition facts, form as many subtraction facts as you can:
99=39+69
Use a number strip to verify your answer.