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Answer :
Final answer:
The student is asked to perform some mental calculations. For 99+54, this can be simplified to 153. For 244×99, it can be seen as 244x100-244 = 24156. Question parts c. 99.6 and d.99.15 seem incomplete as there's no operation present.
Explanation:
To perform these mental calculations: a. 99+54, you can add the tens first (90 + 50 = 140), then the units (9 + 4 = 13), and finally add these two results together (140 + 13 = 153).
For b. 244×99, you can think of it as 244x100-244 which equals, 24400-244, so the answer is 24156.
For c. 99.6, this appears to be a prompt with no operation to perform.
As for d.99.15, this also appears like a prompt with no operation.
Remember, when dealing with mentally adding numbers, it's a good strategy to break them down to simpler forms. Multiplying by 99 is almost the same as multiplying by 100 and subtracting the original number.
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