Addition and Subtraction (Medium)
How good are you at adding and subtracting hundreds?

Addition and Subtraction (Medium)

In this third quiz on addition and subtraction, you are going to get some practice in adding and subtracting hundreds. TIP: With numbers less than 1,000, add the hundreds first, then the tens and then the units. For example:

  • 120 + 360 + 22 + 8 = (100 + 300) + (20 + 60 + 20) + (2 + 8) = 400 + 100 + 10 = 510

Rather than use a pencil and paper for this quiz, try to work the answers out in your head. The more you use your brain in order to work things out, the easier your shopping trips will be.

See if you can beat your classmates in this 11-plus Maths quiz. If you don't get full marks, try again.

In each of the following questions, what is the answer to the given problem?
  1. 245 + 309 - 68 = ?
    245 + 309 - 68 = (200 + 300) + (40 - 60) + (5 + 9 - 8) = 500 - 20 + 6 = 486
  2. 123 + 56 + 684 - 3 = ?
    TIP: With numbers less than 1,000, add the hundreds first, then the tens and then the units. 123 + 56 + 684 - 3 = (100 + 600) + (20 + 50 + 80) + (3 + 6 + 4 - 3) = 700 + 150 + 10 = 860. You can repeat the procedure if you are having difficulty in doing it in your head
  3. 400 + 323 - 23 = ?
    400 + 323 - 23 = (400 + 300) + (20 - 20) + (3 - 3) = 700. Be on the LOOKOUT FOR SHORT CUTS: 323 - 23 = 300
  4. 345 + 450 - 200 = ?
    345 + 450 - 200 = (300 + 400 - 200) + (40 + 50) + (5) = 500 + 90 + 5 = 595
  5. 789 + 567 - 968 = ?
    789 + 567 - 968 = (700 + 500 - 900) + (80 + 60 - 60) + (9 + 7 - 8) = 300 + 80 + 8 = 388
  6. 234 - 450 + 389 = ?
    234 - 450 + 389 = (200 - 400 + 300) + (30 - 50 + 80) + (4 + 9) = 100 + 60 + 13 = 173
  7. 234 - 68 + 2 + 13 = ?
    234 - 68 + 2 + 13 = (200) + (30 - 60 + 10) + (4 + 2 + 3 - 8) = 200 - 20 + 1 = 181
  8. 238 - 78 - 45 + 167 = ?
    238 - 78 - 45 + 167 = (200 + 100) + (30 - 70 - 40 + 60) + (8 - 8 - 5 + 7) = 300 - 20 + 2 = 282
  9. 500 + 200 + 400 - 678 = ?
    500 + 200 + 400 - 678 = (500 + 200 + 400 - 600) - (70) - (8) = 500 - 78 = 422. You can repeat the procedure if you are having difficulty in doing it in your head. Note: with negative numbers, the negative sign is kept with each part of the number, e.g. - 678 is written as -600, -70, -8
  10. 400 - 389 - 400 + 567 = ?
    400 - 389 - 400 + 567 = (500 - 300) + (60 - 80) + (7 - 9) = 200 - 20 - 2 = 178

Author: Frank Evans

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