HOW TO TAKE HALF OF ANY NUMBER PROBLEMS To see the answer, pass your mouse over the colored area. 21. In each column, calculate half of each number mentally.
22. Calculate half mentally.
23 a) Two and a half times $9.00 = $18.00 + $4.50 = $22.50 23. b) Three and a half times $7.00? = $24.50 23. c) Four and a half times $11.00? = $49.50 23. d) Six and a half times $5.00? = $32.50 24. How much is a fourth or a quarter of these? (Take half of half. What
25. How much is 25% of these?
26. a) How many seconds are there in a quarter of a minute? 26. b) How many seconds are in three quarters of a minute? 45 27. Multiplying by 5. Take half the multiplication by 10.
28. How much is 5% of
29. You invest $4,000 in a fund that earns 5% interest each year. If you (Compare Problem 24, Lesson 4. Compound interest..) $4,410. For, at the end of the first year, you will have earned 5%, or $200, in interest, so that you now have $4,000 + $200 = $4,200. At the end of the second year, 5% of that is $210. You now have $4,200 + $210 = $4,410. 30. Multiplying by 15. 13. a) 15 × 12 = 180 b) 15 × 16 = 240 18. c) 15 × 24 = 360 d) 15 × 46 = 690 31. How much is 15% of 19. a) $20? $3 b) $30? $4.50 c) $18? $2.70 19. d) $40? $6 e) $60? $9 f) $70? $10.50 Continue on to the next Lesson. or Return to the previous section. Copyright © 2021 Lawrence Spector Questions or comments? E-mail: teacher@themathpage.com |