MENTAL ARITHMETIC: ADDITION PROBLEMS 2 To see the answer, pass your mouse over the colored area. 11. Rounding off. Add mentally. 11. a) 98 + 98 + 98 = 294 b) 2.95 + 6.95 + 8.95 = 18.85 11. c) 4.99 + 7.99 + 1.99 = 14.97 d) 2.75 + .95 = 3.70 12. Regroup to form a multiple of 10.
13. Add these dollars and cents mentally. Add the cents first. 3.59 + 5.25 = 8.84 5.75 + 2.36 = 8.11 2.48 + 4.45 = 6.93 7.57 + 4.84 = 12.41 5.29 + 1.23 = 6.52 8.39 + 5.86 = 14.25 4.77 + 9.93 = 14.70 9.56 + 5.78 = 15.34 14. If one item costs $3.59, and another, $4.79, what do you pay? 8.38 15. If you buy two tubes of toothpaste at
$2.29 each, what do you 16. Regrouping. Add mentally. 16. a) 17 + 56 + 3 = 20 + 56 = 76 16. b) 4 + 5 + 4 + 5 + 4 + 5 = 27 16. c) 10 + 6 + 10 + 6 + 10 + 6 = 48 16. c) How much is 3 × 16? = 48 16. d) 2 + 9 + 8 + 1 + 3 + 5 + 7 = 35 Continue on to the next Lesson. or Return to the previous section. Please make a donation to keep TheMathPage online. Copyright © 2001-2007 Lawrence Spector Questions or comments? E-mail: themathpage@nyc.rr.com |