• Introduction long division
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  • 30.11.2021
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Long division with dad, mom, sister and brother
Dad, mom, sister, brother?!

These four words (in the acronym DMSB) help you remember

the four steps in long division.

  • dad = divide
  • mom = multiply
  • sister = subtract
  • brother = bring down
Let's walk through an example together.
65 ÷ 5 = ?

1. Divide: How many times does 5 fit into 6? 1 Time. Write the 1 on the line.
2. Multiply: What does 5 x 1 equal?
Write the solution 5 under the 6.
3. Subtract: What is 6 minus 5?
Draw a line and write the solution 1 underneath.
4. Bring down: Bring down the next number of the dividend. In this case we put the 5 next to the 1, making the number 15.
5. Divide: How many times does 5 fit into 15?
15 ÷ 5 = 3. Write the 3 on the line.
6. Multiply: What does 5 x 3 equal?
Write the solution 15 under the 15.
7. Subtract: 15 - 15 = 0.
We've finished our problem! :)
Now you: Solve 72 ÷ 2 and 84 ÷ 3. The acronym DMSB will help you.
Let's do a quick warm-up for your brain!
1
Solve the following addition problems!
  • 4 + 7 =
  • 4 + 8 =
  • 9 + 5 =
  • 10 + 9 =
  • 7 + 2 =
  • 6 + 6 =
  • 10 + 7 =
  • 7 + 7 =
  • 2 + 6 =
  • 9 + 9 =
2
Solve the following subtraction problems!
  • 51 - 8 =
  • 88 - 4 =
  • 71 - 1 =
  • 47 - 41 =
  • 52 - 14 =
  • 89 - 55 =
  • 50 - 18 =
  • 76 - 1 =
  • 47 - 15 =

Show your thinking work/take notes here:

3
Solve the following problems!
  • 71 + = 76
  • 45 + = 48
  • 15 + = 21
  • 56 + = 60
  • 54 + = 63
  • 57 + = 65
  • 38 + = 42
  • 72 + = 74
  • 47 + = 52

Show your thinking work/take notes here:

Tip

Try transfroming these problems from addition to subtraction - that might help you! :)

4
Solve the following addition problems!
  • 93 + 4 =
  • 43 + 9 =
  • 76 + 9 =
  • 39 + 3 =
  • 10 + 7 =
  • 83 + 9 =
  • 20 + 3 =
  • 76 + 8 =
  • 66 + 4 =
Let's do a quick warm-up for your brain!
1
Solve the following subtraction problems!
  • 17 - 4 =
  • 13 - 4 =
  • 15 - 8 =
  • 16 - 9 =
  • 18 - 4 =
  • 14 - 8 =
  • 10 - 8 =
  • 10 - 8 =
  • 14 - 5 =
  • 13 - 8 =
1
Solve the following addition problems!
  • 75 + 2 =
  • 43 + 9 =
  • 54 + 7 =
  • 22 + 4 =
  • 36 + 8 =
  • 83 + 6 =
  • 44 + 4 =
  • 90 + 3 =
  • 78 + 7 =
  • 7 + 1 =
  • 68 + 5 =
  • 69 + 5 =

Show your thinking work/take notes here:

2
Solve the following problems!
  • 10 + = 30
  • 29 + = 63
  • 16 + = 86
  • 62 + = 118
  • 81 + = 115
  • 69 + = 100
  • 46 + = 94
  • 15 + = 82
  • 100 + = 164



Show your thinking work/take notes here:

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