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question 88
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2.5 × 300
answer:
question 89
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2.06 × 0.8
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question 90
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0.04 × 5000
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Explanation:

Question 88

Step1: Multiply 2.5 and 300

$2.5\times300 = 2.5\times3\times100$

Step2: Calculate 2.5×3 first

$2.5\times3 = 7.5$

Step3: Multiply by 100

$7.5\times100 = 750$

Step1: Multiply 2.06 and 0.8

$2.06\times0.8$

Step2: Treat as 206×8 and adjust decimal

$206\times8 = 1648$, then move decimal 3 places (2.06 has 2 decimals, 0.8 has 1, total 3)
$1648\div1000 = 1.648$

Step1: Multiply 0.04 and 5000

$0.04\times5000 = 4\times5000\div100$

Step2: Calculate 4×5000

$4\times5000 = 20000$

Step3: Divide by 100

$20000\div100 = 200$

Answer:

750

Question 89