Post on 23-Jun-2015
Multiplying a 3 Digit Decimal Number by a
1 Digit NumberUsing a Standard Written Method
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For example 3.97 x 6
For example 3.97 x 6Set the question out like this:
For example 3.97 x 6Set the question out like this:
T U . t h
3 . 9 7
X 6 2 9 . 8 2
Always make sure that the decimal points are lined up correctly
T U . t h
3 . 9 7
X 6 2 9 . 8 2
Always make sure that the decimal points are lined up correctly
T U . t h
3 . 9 7
X 6 2 9 . 8 2
Then multiply the number in the hundredths column (7)
T U . t h
3 . 9 7
X 6 2 9 . 8 2
Then multiply the number in the hundredths column (7) by 6
T U . t h
3 . 9 7
X 6 2 9 . 8 2
7 x 6 =
T U . t h
3 . 9 7
X 6 2 9 . 8 2
7 x 6 = 42
T U . t h
3 . 9 7
X 6 2 9 . 8 2
7 x 6 = 42The 2 is placed in the answer bar, in the hundredths column
T U . t h
3 . 9 7
X 6 2 9 . 8 2
7 x 6 = 42The 2 is placed in the answer bar, in the hundredths column
T U . t h
3 . 9 7
X 6 2 9 . 8 2
7 x 6 = 42The 4 is placed under the answer bar, under the tenths column
T U . t h
3 . 9 7
X 6 2 9 . 8 2
7 x 6 = 42The 4 is placed under the answer bar, under the tenths column
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2
Next, multiply the number in the tenths column (9)
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2
Next, multiply the number in the tenths column (9) by 6
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2
9 x 6 =
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2
9 x 6 = 54
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2
9 x 6 = 54This is added to the 4 from under the tenths column
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2
54 + 4 = 58
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2
54 + 4 = 58The 8 is put in the tenths column
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2
54 + 4 = 58The 5 is placed under the answer bar, under the units column
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2 5
Now, multiply the number in the units column (3)
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2 5
Now, multiply the number in the units column (3) by 6
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2 5
3 x 6 = 18
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2 5
3 x 6 = 18This is added to the 5 from under the units column
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2 5
18 + 5 = 23
T U . t h
3 . 9 7
X 6
4
2 3 . 8 2 5
18 + 5 = 23The 3 is placed in the units column
T U . t h
3 . 9 7
X 6
4
2 9 . 8 2 5
18 + 5 = 23The 3 is placed in the units column
T U . t h
3 . 9 7
X 6
4
2 3 . 8 2 5
18 + 5 = 23The 2 is placed in the tens column
T U . t h
3 . 9 7
X 6
4
2 3 . 8 2 5
18 + 5 = 23The 2 is placed in the tens column
T U . t h
3 . 9 7
X 6
4
2 3 . 8 2 5
3.97 x 6 = 23.82
T U . t h
3 . 9 7
X 6
4
2 3 . 8 2 5
That’s it for now......For more help with your maths, try
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