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Mental Math. A Life Long Skill. Mental Math # 1. 7000 + 300 + 40 + 3 = 9000 + 70 + 3 = 2000 + 50 + 400 + 4 = 50 + 4000 + 7 + 300 = 5 x 1000 + 3 x 100 + 9 x 10 + 2 x 1 = 4 x 100 + 8 x 1 + 5 x 1000 = 50 000 + 3000 + 20 + 7 = 500 + 300 + 40 = 80 + 40 + 20 + 2 = 4000 + 500 + 3000 + 20 =.

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Mental Math


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    1. Mental Math A Life Long Skill

    2. Mental Math # 1 • 7000 + 300 + 40 + 3 = • 9000 + 70 + 3 = • 2000 + 50 + 400 + 4 = • 50 + 4000 + 7 + 300 = • 5 x 1000 + 3 x 100 + 9 x 10 + 2 x 1 = • 4 x 100 + 8 x 1 + 5 x 1000 = • 50 000 + 3000 + 20 + 7 = • 500 + 300 + 40 = • 80 + 40 + 20 + 2 = • 4000 + 500 + 3000 + 20 =

    3. Mental Math # 1 • 7000 + 300 + 40 + 3 = 7343 • 9000 + 70 + 3 = 9073 • 2000 + 50 + 400 + 4 = 2454 • 50 + 4000 + 7 + 300 = 4357 • 5 x 1000 + 3 x 100 + 9 x 10 + 2 x 1 = 5392 • 4 x 100 + 8 x 1 + 5 x 1000 = 5408 • 50 000 + 3000 + 20 + 7 = 53 027 • 500 + 300 + 40 = 840 • 80 + 40 + 20 + 2 = 142 • 4000 + 500 + 3000 + 20 = 7520

    4. Mental Math # 2 • 500 + 3000 + 70 + 3 = • 6000 + 700 + 3 • 2000 + 500 + 40 + 4 = • 50 000 + 30 + 7 + 8000 = • 3 x 10 000 + 1 x 1000 + 9 x 100 + 2 x 10 + 3 x 1 = • 4 x 1000 + 2 x 1 + 5 x 100 = • 200 + 300 + 20 + 5 = • 500 + 500 + 400 + 24 = • 40 + 60 + 20 + 70 + 30 = • 4200 + 500 + 60 =

    5. Mental Math # 2 • 500 + 3000 + 70 + 3 = 3573 • 6000 + 700 + 3 = 6703 • 2000 + 500 + 40 + 4 = 2544 • 50 000 + 30 + 7 + 8000 = 58 037 • 3 x 10 000 + 1 x 1000 + 9 x 100 + 2 x 10 + 3 x 1 = 31 923 • 4 x 1000 + 2 x 1 + 5 x 100 = 4502 • 200 + 300 + 20 + 5 = 525 • 500 + 500 + 400 + 24 = 1424 • 40 + 60 + 20 + 70 + 30 = 220 • 4200 + 500 + 60 = 4760

    6. Mental Math # 3 • 90 + 7000 + 500 + 6 = • 60 000 + 400 + 20 + 3 = • 300 + 700 + 80 + 4 = • 50 000 + 30 + 7 + 8000 = • 3 x 1000 + 9 x 100 + 6 x 10 + 2 x 1 = • 4 x 1000 + 2 x 10 000 + 8 x 100 = • 20 + 80 + 30 + 5 + 70 = • 900 + 600 + 400 + 72 + 100 = • 2000 + 8000 + 700 + 30 = • 5100 + 900 + 70 =

    7. Mental Math # 3 • 90 + 7000 + 500 + 6 = 7596 • 60 000 + 400 + 20 + 3 = 60 423 • 300 + 700 + 80 + 4 = 1084 • 50 000 + 30 + 7 + 8000 = 58 037 • 3 x 1000 + 9 x 100 + 6 x 10 + 2 x 1 = 3962 • 4 x 1000 + 2 x 10 000 + 8 x 100 = 24 800 • 20 + 80 + 30 + 5 + 70 = 205 • 900 + 600 + 400 + 72 + 100 = 2072 • 2000 + 8000 + 700 + 30 = 10 730 • 5100 + 900 + 70 = 6070

    8. Mental Math # 4 • 20 + 6000 + 400 + 7 = • 50 000 + 9000 + 200 + 30 = • 400 + 600 + 3 + 40 = • 20 000 + 300 + 9 + 4000 = • 5 x 1000 + 3 x 100 + 7 x 10 + 2 x 1 = • 7 x 1000 + 8 x 10 000 + 6 x 100 = • 50 + 90 + 50 + 5 + 10 = • 300 + 600 + 700 + 42 = • 4000 + 500 + 500 + 33 = • 3700 + 300 + 76 =

    9. Mental Math # 4 • 20 + 6000 + 400 + 7 = 6427 • 50 000 + 9000 + 200 + 30 = 59 230 • 400 + 600 + 3 + 40 = 1043 • 20 000 + 300 + 9 + 4000 = 24 309 • 5 x 1000 + 3 x 100 + 7 x 10 + 2 x 1 = 5372 • 7 x 1000 + 8 x 10 000 + 6 x 100 = 87600 • 50 + 90 + 50 + 5 + 10 = 205 • 300 + 600 + 700 + 42 = 1642 • 4000 + 500 + 500 + 33 = 5033 • 3700 + 300 + 76 = 4076

    10. Mental Math # 5 • 200 + 60 000 + 4 + 70 = • 50 + 80 + 90 + 20 + 10 = • 400 + 600 + 3000 + 400 = • 23 + 300 + 7 = • 6 x 1000 + 2 x 100 + 0 x 10 + 2 x 1 = • 9 x 1000 + 8 x 10 000 + 6 x 100 + 4 x 10 = • 9 + 7 = • 90 + 70 = • 139 + 7 = • 390 + 70 =

    11. Mental Math # 5 • 200 + 60 000 + 4 + 70 = 60 274 • 50 + 80 + 90 + 20 + 10 = 250 • 400 + 600 + 3000 + 400 = 4400 • 23 + 300 + 7 = 330 • 6 x 1000 + 2 x 100 + 0 x 10 + 2 x 1 = 6202 • 9 x 1000 + 8 x 10 000 + 6 x 100 + 4 x 10 = 89 640 • 9 + 7 = 16 • 90 + 70 = 160 • 139 + 7 = 146 • 390 + 70 = 460

    12. Mental Math # 6 • 500 + 20 + 500 + 80 = • 30 + 80 + 70 + 10 + 10 = • 200 + 800 + 30 + 400 = • 51 + 3000 + 9 = • 8 x 1000 + 3 x 100 + 4 x 10 + 4 x 1 = • 9 x 10 000 + 8 x 1 + 6 x 1000 = • 7 + 5 = • 70 + 50 = • 127 + 5 = • 330 + 37 =

    13. Mental Math # 6 • 500 + 20 + 500 + 80 = 1100 • 30 + 80 + 70 + 10 + 10 = 200 • 200 + 800 + 30 + 400 = 1430 • 51 + 3000 + 9 = 3060 • 8 x 1000 + 3 x 100 + 4 x 10 + 4 x 1 = 8344 • 9 x 10 000 + 8 x 1 + 6 x 1000 = 96 008 • 7 + 5 = 12 • 70 + 50 = 120 • 127 + 5 = 132 • 330 + 37 = 367

    14. Mental Math # 7 • 48 + 21 = • 53 + 34 = • 34 + 52 = • 456 + 120 = • 438 + 340 = • 629 + 310 = • 400 + 231 = • 456 + 42 = • 381 + 405 = • 705 + 220 =

    15. Mental Math # 7 • 48 + 21 = 69 • 53 + 34 = 87 • 34 + 52 = 86 • 456 + 120 = 576 • 438 + 340 = 778 • 629 + 310 = 939 • 400 + 231 = 631 • 456 + 42 = 498 • 381 + 405 = 786 • 705 + 220 = 925

    16. Mental Math # 8 • 430 + 53 = • 510 + 87 = • 349 + 220 = • 456 + 440 = • 352 + 527 = • 600 + 350 = • 434 + 231 = • 156 + 420 = • 321 + 45 = • 615 + 224 =

    17. Mental Math # 8 • 430 + 53 = 483 • 510 + 87 = 597 • 349 + 220 = 569 • 456 + 440 = 896 • 352 + 527 = 879 • 600 + 350 = 950 • 434 + 231 = 665 • 156 + 420 = 576 • 321 + 45 = 366 • 615 + 224 = 839

    18. Mental Math # 9 • 974 + 23 = • 320 + 29 = • 341 + 208 = • 677 + 320 = • 425 + 563 = • 60 + 322 = • 400 + 231 = • 424 + 424 = • 333 + 425 = • 610 + 220 =

    19. Mental Math # 9 • 974 + 23 = 997 • 320 + 29 = 349 • 341 + 208 = 549 • 677 + 320 = 997 • 425 + 563 = 988 • 60 + 322 = 382 • 400 + 231 = 631 • 424 + 424 = 848 • 333 + 425 = 758 • 610 + 220 = 830

    20. Mental Math # 10 • 543 + 253 = • 841 + 200 = • 128 + 331 = • 415 + 363 = • 52 + 315 = • 400 + 200 + 387 = • 398 + 502 = • 260 + 540 = 9) 390 + 208 = 10) 111 + 111 + 111 =

    21. Mental Math # 10 • 543 + 253 = 796 • 841 + 200 = 1041 • 128 + 331 = 459 • 415 + 363 = 778 • 52 + 315 = 367 • 400 + 200 + 387 = 987 • 398 + 502 = 900 • 260 + 540 = 800 9) 390 + 208 = 598 10) 111 + 111 + 111 = 333

    22. Mental Math # 11 • Five and three tenths = • Thirty two and four hundredths = • Seventy-seven thousandths = • Two hundred four and five hundredths = • Nine hundredths = • 4 + 0.2 = • 30 + 5 + 0.9 + 0.07 = • 200 + 0.8 = 9) (5 x 1) + (2 x 0.1) + (4 x 0.01) = 10) 3 x 100 + 6 x 0.01 =

    23. Mental Math # 11 • Five and three tenths = 5.3 • Thirty two and four hundredths = 32.04 • Seventy-seven thousandths = 0.077 • Two hundred four and five hundredths = 204.05 • Nine hundredths = 0.09 • 4 + 0.2 = 4.2 • 30 + 5 + 0.9 + 0.07 = 35.97 • 200 + 0.8 = 200.8 9) (5 x 1) + (2 x 0.1) + (4 x 0.01) = 5.24 10) 3 x 100 + 6 x 0.01 = 300.06

    24. Mental Math # 12 • Nine and three hundredths = • Thirty two and four tenths = • Seven thousandths = • Three hundred and fifteen thousandths = • Nine hundredths = • 5 + 0.2 + 0.06 = • 300 + 50 + 0.9 + 0.04 = • 20 + 0.08 + 3 = 9) (5 x 0.001) + (2 x 0.01) + (4 x 0.1) = 10) 3 x 100 + 6 x 0.1 + 4 x 1 =

    25. Mental Math # 12 • Nine and three hundredths = 9.03 • Thirty two and four tenths = 32.4 • Seven thousandths = 0.007 • Three hundred and fifteen thousandths = 300.015 • Nine hundredths = 0.09 • 5 + 0.2 + 0.06 = 5.26 • 300 + 50 + 0.9 + 0.04 = 350.94 • 20 + 0.08 + 3 = 23.08 9) (5 x 0.001) + (2 x 0.01) + (4 x 0.1) = 0.425 10) 3 x 100 + 6 x 0.1 + 4 x 1 = 304.6

    26. Mental Math # 13 1)

    27. 2)

    28. 3)

    29. 4)

    30. 5)

    31. 6)

    32. 7)

    33. 8)

    34. 9)

    35. 10)

    36. Mental Math # 13 1) One and four tenths or 1.4

    37. 2) Fifty-three hundredths or 0.53

    38. 3) One and three hundredths or 1.03

    39. 4) One and Two tenths or 1.2

    40. 5) One and thirty-four thousandths or 1. 034

    41. 6) Five thousandths or 0.005

    42. 7) One and thirteen thousandths or 1.013

    43. 8) Two and one hundred forty-two thousandths or 2.142

    44. 9) Twenty-two thousandths or 0.022

    45. 10) One and five hundredths or 1.05

    46. Mental Math # 14 • 3.25 or 3.5 • 2.000 or 2.001 • 0.98 or 0.89 = • 98.9 or 98.19 • 10.01 or 10.010 = • 6.6 or 6.60 • Two hundredths or two thousandths = • 1.9 or 0.999 • 1 or 0.95 = • 636 or 663 =

    47. Mental Math # 14 • 3.25 or 3.5 • 2.000 or 2.001 • 0.98 or 0.89 • 98.9 or 98.19 • 10.01 or 10.010 • 6.6 or 6.60 • Two hundredths or two thousandths • 1.9 or 0.999 • 1 or 0.95 • 636 or 663

    48. Mental Math # 15 • 3.25 rounded to the nearest tenth = • 234.9 rounded to the nearest whole number = • 1.984 rounded to the nearest hundredth = • 48.9 rounded to the nearest ten = • 10.08 rounded to the nearest tenth = • 6.6 rounded to the nearest whole number = • 1465.9 rounded to the nearest hundred = • 7.3 rounded to the nearest whole number = • 0.6544 rounded to the nearest thousandths = • 1.95 rounded to the nearest tenth =

    49. Mental Math # 15 • 3.25 rounded to the nearest tenth = 3.3 • 234.9 rounded to the nearest whole number = 235 • 1.984 rounded to the nearest hundredth = 1.98 • 48.9 rounded to the nearest ten = 50 • 10.08 rounded to the nearest tenth = 10.1 • 6.6 rounded to the nearest whole number = 7 • 1465.9 rounded to the nearest hundred = 1500 • 7.3 rounded to the nearest whole number = 7 • 0.6544 rounded to the nearest thousandths = 0.654 • 1.95 rounded to the nearest tenth = 2

    50. Mental Math # 16 • 10 x 30 = • 3 x 500 = • 2.4 x 2 = • 5 x 80 = • 100 x 38 = • 6.2 x 2 = • 90 x 50 = • 300 x 20 = • 10 x 96 = • 1.25 x 3 =