Find the sum of the first 144 natural numbers.

a. \( \frac{1}{4} \cdot \frac{3}{4}= \)

Lelt's Discuss A wristwatch was sold for Php 2500.00 with a \( 20 \% \) discount. What was the original price of the wristwatch? Solution: \( D R=20 \%, \mathrm{SP}=2,500, \mathrm{OP}= \) ?

1) \( a=8 \frac{2}{5} \) vo \( b=1 \frac{1}{20} \) olduqda \( 0,2 \cdot(a: b) \) ifadosinin qiymotini tapın. 2) \( a=1 \frac{3}{23} \) vo \( b=4 \frac{5}{23} \) olduqda \( (b: a): 2 \frac{1}{2} \) ifadosinin qiymotini tapın.

Express 1728 and 2025 in terms of their prime factors. Hence evaluate \( \frac{\sqrt[3]{1728}}{\sqrt{2025}} \)

Write down the following numbers in standard form. a 640000 b 0.0006