Answer:
The answer is C I believe.
Step-by-step explanation:
It gets you closer to your answer.
Ex: 11×2-- Round 11 to 10 and then multiply and get 20. But if you get some answer like 50, you know it is wrong. But the answer is 23
Answer:
k=48
Step-by-step explanation:
Add -29 and 77
k: -3k -3k =48
Answer:
the answer is the first one I think but I'm pretty sure