1. Find the sum of 237 and 489. 2. If you have 15 apples and you give away 7, how many apples do you have left? 3. What is 9 multiplied by 8? 4. Divide 144 by 12. 5. If a rectangle has a length of 10 cm and a width of 5 cm, what is its area? 6. Find the value of $x$ if $2x + 5 = 15$. 7. Round 3.672 to the nearest tenth. 8. Convert 0.75 to a fraction. 9. Write the number 45,619 in expanded form. 10. Identify the prime numbers between 10 and 20.