High School

Add:

1. 16, 8.7, 0.94, 6.8, and 7.77
2. 18.6, 206.37, 8.008, 26.4, and 6.9
3. 63.5, 9.7, 0.8, 26.66, and 12.17
4. 17.4, 86.39, 9.435, 8.8, and 0.06
5. 26.9, 19.74, 231.769, and 0.048
6. 23.8, 8.94, 0.078, and 214.6
7. 6.606, 66.6, 666, 0.066, and 0.66
8. 9.09, 0.909, 99.9, 9.99, and 0.099

Subtract:

9. 14.79 from 72.43
10. 36.74 from 52.6
11. 13.876 from 22
12. 15.079 from 24.16
13. 0.68 from 1.007
14. 0.4678 from 5.05
15. 2.5307 from 8
16. 6.732 from 9.001
17. Take out 5.746 from 9.1

18. What is to be added to 63.58 to get 92?
19. What is to be subtracted from 8.1 to get 0.813?
20. By how much should 32.67 be increased to get 60.1?
21. By how much should 74.3 be decreased to get 26.87?

22. Rohit purchased a notebook for ₹23.75, a pencil for ₹2.85, and a pen for ₹15.90. He gave a 50-rupee note to the shopkeeper. What amount did he get back?

Answer :

Let's go through each arithmetic operation one by one.

Addition Problems:

  1. Add: [tex]16 + 8.7 + 0.94 + 6.8 + 7.772[/tex]

    Solution: First, line up the decimal points:

    [
    \begin{array}{r}
    16.000 \

    • 8.700 \
    • 0.940 \
    • 6.800 \
    • 7.772 \
      \hline
      40.212
      \end{array}
      ]

  2. Add: [tex]18.6 + 206.37 + 8.008 + 26.4 + 6.93[/tex]

    Solution:

    [
    \begin{array}{r}
    18.600 \

    • 206.370 \
    • 8.008 \
    • 26.400 \
    • 6.930 \
      \hline
      266.308
      \end{array}
      ]

  3. Add: [tex]63.5 + 9.7 + 0.8 + 26.66 + 12.174[/tex]

    Solution:

    [
    \begin{array}{r}
    63.500 \

    • 9.700 \
    • 0.800 \
    • 26.660 \
    • 12.174 \
      \hline
      112.834
      \end{array}
      ]

  4. Add: [tex]17.4 + 86.39 + 9.435 + 8.8 + 0.065[/tex]

    Solution:

    [
    \begin{array}{r}
    17.400 \

    • 86.390 \
    • 9.435 \
    • 8.800 \
    • 0.065 \
      \hline
      122.090
      \end{array}
      ]

  5. Add: [tex]26.9 + 19.74 + 231.769 + 0.048[/tex]

    Solution:

    [
    \begin{array}{r}
    26.900 \

    • 19.740 \
    • 231.769 \
    • 0.048 \
      \hline
      278.457
      \end{array}
      ]

  6. Add: [tex]23.8 + 8.94 + 0.078 + 214.67[/tex]

    Solution:

    [
    \begin{array}{r}
    23.800 \

    • 8.940 \
    • 0.078 \
    • 214.670 \
      \hline
      247.488
      \end{array}
      ]

  7. Add: [tex]6.606 + 66.6 + 666 + 0.066 + 0.668[/tex]

    Solution:

    [
    \begin{array}{r}
    6.606 \

    • 66.600 \
    • 666.000 \
    • 0.066 \
    • 0.668 \
      \hline
      739.940
      \end{array}
      ]

  8. Add: [tex]9.09 + 0.909 + 99.9 + 9.99 + 0.099[/tex]

    Solution:

    [
    \begin{array}{r}
    9.090 \

    • 0.909 \
    • 99.900 \
    • 9.990 \
    • 0.099 \
      \hline
      120.988
      \end{array}
      ]

Subtraction Problems:

  1. Subtract: [tex]14.79[/tex] from [tex]72.43[/tex]

    Solution:

    [tex]72.43 - 14.79 = 57.64[/tex]

  2. Subtract: [tex]36.74[/tex] from [tex]52.6[/tex]

    Solution:

    [tex]52.6 - 36.74 = 15.86[/tex]

  3. Subtract: [tex]13.876[/tex] from [tex]22[/tex]

    Solution:

    [tex]22.000 - 13.876 = 8.124[/tex]

  4. Subtract: [tex]15.079[/tex] from [tex]24.16[/tex]

    Solution:

    [tex]24.160 - 15.079 = 9.081[/tex]

  5. Subtract: [tex]0.68[/tex] from [tex]1.007[/tex]

    Solution:

    [tex]1.007 - 0.680 = 0.327[/tex]

  6. Subtract: [tex]0.4678[/tex] from [tex]5.05[/tex]

    Solution:

    [tex]5.0500 - 0.4678 = 4.5822[/tex]

  7. Subtract: [tex]2.5307[/tex] from [tex]8[/tex]

    Solution:

    [tex]8.0000 - 2.5307 = 5.4693[/tex]

  8. Subtract: [tex]6.732[/tex] from [tex]9.001[/tex]

    Solution:

    [tex]9.001 - 6.732 = 2.269[/tex]

  9. Subtract: [tex]5.746[/tex] from [tex]9.11[/tex]

    Solution:

    [tex]9.110 - 5.746 = 3.364[/tex]

Additional/Reduction Problems:

  1. What is to be added to [tex]63.58[/tex] to get [tex]92[/tex]?

    Solution:

    [tex]92 - 63.58 = 28.42[/tex]

  2. What is to be subtracted from [tex]8.1[/tex] to get [tex]0.813[/tex]?

    Solution:

    [tex]8.1 - 0.813 = 7.287[/tex]

  3. By how much should [tex]32.67[/tex] be increased to get [tex]60.1[/tex]?

    Solution:

    [tex]60.1 - 32.67 = 27.43[/tex]

  4. By how much should [tex]74.3[/tex] be decreased to get [tex]26.87[/tex]?

    Solution:

    [tex]74.3 - 26.87 = 47.43[/tex]

Word Problem:

  1. Rohit purchased three items: a notebook for ₹23.75, a pencil for ₹2.85, and a pen for ₹15.90. He paid with a ₹50 note. How much did he get back?

    Solution:

    1. First, find the total amount spent.

      [tex]23.75 + 2.85 + 15.90 = 42.50[/tex]

    2. Then, subtract this total from ₹50.

      [tex]50.00 - 42.50 = 7.50[/tex]

    Rohit got back ₹7.50.

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