Multiplying using the grid method.
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Multiplying using the grid method.
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Multiplying using the grid method. We will look at the three basic grids. Multiplying by a single digit. E.g. 26 x 7 Multiplying double digits. E.g. 32 x 48 Multiplying triple digits. E.g. 123 x 174. X. Multiplying by a single digit. E.g. 26 x 7. Draw the grid. 20. 6. - PowerPoint PPT Presentation
Transcript of Multiplying using the grid method.
Multiplying using the grid method.
We will look at the three basic grids.
• Multiplying by a single digit. E.g. 26 x 7
• Multiplying double digits. E.g. 32 x 48
• Multiplying triple digits. E.g. 123 x 174
Multiplying by a single digit. E.g. 26 x 7
1. Draw the grid.
X
Multiplying by a single digit. E.g. 26 x 7
2. Split 26 into 20 and 6 and fill in the top of the table.
X 20 6
1. Draw the grid.
Multiplying by a single digit. E.g. 26 x 7
2. Split 26 into 20 and 6 and fill in the top of the grid.
X 20 6
1. Draw the grid.
3. Add the 7 to the grid.
7
Multiplying by a single digit. E.g. 26 x 7
2. Split 26 into 20 and 6 and fill in the top of the grid.
X 20 6
1. Draw the grid.
3. Add the 7 to the grid.
74. Multiply the 20 by 7.
140
Multiplying by a single digit. E.g. 26 x 7
2. Split 26 into 20 and 6 and fill in the top of the grid.
X 20 6
1. Draw the grid.
3. Add the 7 to the grid.
74. Multiply the 20 by 7.
140
5. Multiply the 6 by 7.
42
Multiplying by a single digit. E.g. 26 x 7
2. Split 26 into 20 and 6 and fill in the top of the grid.
X 20 6
1. Draw the grid.
3. Add the 7 to the grid.
74. Multiply the 20 by 7.
140
5. Multiply the 6 by 7.
42
6. Add the totals together
182
Multiplying double digits. E.g. 32 x 481. Draw the grid.
x
Multiplying double digits. E.g. 32 x 48
2. Split 32 into 30 and 2 and fill in the top of the grid.1. Draw the grid.
x 30 2
Multiplying double digits. E.g. 32 x 48
2. Split 32 into 30 and 2 and fill in the top of the grid.1. Draw the grid.
3. Split 48 into 40 and 8 and fill in the side of the grid.
x 30 2
40
8
Multiplying double digits. E.g. 32 x 48
2. Split 32 into 30 and 2 and fill in the top of the grid.1. Draw the grid.
3. Split 48 into 40 and 8 and fill in the side of the grid.
4. Multiply the 40 by 30.
x 30 2
40 1200
8
Multiplying double digits. E.g. 32 x 48
2. Split 32 into 30 and 2 and fill in the top of the grid.1. Draw the grid.
3. Split 48 into 40 and 8 and fill in the side of the grid.
4. Multiply the 40 by 30.5. Multiply the 40 by 2.
x 30 2
40 1200
80
8
Multiplying double digits. E.g. 32 x 48
2. Split 32 into 30 and 2 and fill in the top of the grid.1. Draw the grid.
3. Split 48 into 40 and 8 and fill in the side of the grid.
4. Multiply the 40 by 30.5. Multiply the 40 by 2.
x 30 2
40 1200
80
8 240
6. Multiply the 8 by 30.
Multiplying double digits. E.g. 32 x 48
2. Split 32 into 30 and 2 and fill in the top of the grid.1. Draw the grid.
3. Split 48 into 40 and 8 and fill in the side of the grid.
4. Multiply the 40 by 30.5. Multiply the 40 by 2.
x 30 2
40 1200
80
8 240 16
6. Multiply the 8 by 30.7. Multiply the 8 by 2.
Multiplying double digits. E.g. 32 x 48
2. Split 32 into 30 and 2 and fill in the top of the grid.1. Draw the grid.
3. Split 48 into 40 and 8 and fill in the side of the grid.
4. Multiply the 40 by 30.5. Multiply the 40 by 2.
8. Add the totals together
x 30 2
40 1200
80 1280
8 240 16
6. Multiply the 8 by 30.7. Multiply the 8 by 2.
Multiplying double digits. E.g. 32 x 48
2. Split 32 into 30 and 2 and fill in the top of the grid.1. Draw the grid.
3. Split 48 into 40 and 8 and fill in the side of the grid.
4. Multiply the 40 by 30.5. Multiply the 40 by 2.
8. Add the totals together
x 30 2
40 1200
80 1280
8 240 16 256
6. Multiply the 8 by 30.7. Multiply the 8 by 2.
Multiplying double digits. E.g. 32 x 48
2. Split 32 into 30 and 2 and fill in the top of the grid.1. Draw the grid.
3. Split 48 into 40 and 8 and fill in the side of the grid.
4. Multiply the 40 by 30.5. Multiply the 40 by 2.
8. Add the totals together
x 30 2
40 1200
80 1280
8 240 16 256
1536
6. Multiply the 8 by 30.7. Multiply the 8 by 2.
Multiplying triple digits. E.g. 123 x 1741. Draw the grid.
x
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
x 100 20 3
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
x 100 20 3
100
70
4
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
x 100 20 3
100 10000
70
4
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
x 100 20 3
100 10000 2000
70
4
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
x 100 20 3
100 10000 2000 300
70
4
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
x 100 20 3
100 10000 2000 300
70 7000
4
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
x 100 20 3
100 10000 2000 300
70 7000 1400
4
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
x 100 20 3
100 10000 2000 300
70 7000 1400 210
4
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
x 100 20 3
100 10000 2000 300
70 7000 1400 210
4 400
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
x 100 20 3
100 10000 2000 300
70 7000 1400 210
4 400 80
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
x 100 20 3
100 10000 2000 300
70 7000 1400 210
4 400 80 12
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
5. Add the totals together
x 100 20 3
100 10000 2000 300 12300
70 7000 1400 210
4 400 80 12
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
5. Add the totals together
x 100 20 3
100 10000 2000 300 12300
70 7000 1400 210 8610
4 400 80 12
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
5. Add the totals together
x 100 20 3
100 10000 2000 300 12300
70 7000 1400 210 8610
4 400 80 12 492
Multiplying triple digits. E.g. 123 x 174
2. Split 123 into 100, 20 and 3 and fill in the top of the grid.1. Draw the grid.
3. Split 174 into 100, 70 and 4 and fill in the side of the grid.
4. Cross multiply the numbers as before.
5. Add the totals together
x 100 20 3
100 10000 2000 300 12300
70 7000 1400 210 8610
4 400 80 12 492
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