Answer: She bought about 150 markers.
Step-by-step explanation:
Given : A teacher bought 15 boxes of markers.
i.e. Total boxes of markers = 15
Each box contained 8 markers.
That is , the estimated number of markers in each box = 10 [∵ 8≈10 [Round to the nearest tens]]
Now , the total number of markers in all 15 boxes of markers = (15) x (10)
= 150
Hence, she bought about 150 markers.
