Presentation on theme: "Multiplying Large Numbers (Traditional Method)"— Presentation transcript:
1Multiplying Large Numbers (Traditional Method) Created by: Sabrina EdmondsonAdapted from BBC online
2Multiplying Large Numbers If this method seems familiar it might be because you were encouraged to use it in school. Talking through the method is far easier than trying to follow written instructions.
3Multiplying Large Numbers Have a look at how the equation 235 x 5 can be worked out using this method. Step 1: 5 x 5 = 25. Put the 5 in the units column, and carry the 2 to the tens.HTO235x
4Multiplying Large Numbers Step 2: 3 x 5 = 15.Add the 2 makes 17.7 goes into the ten’s column and carry the 1 to the hundred’s column.HTO1235x7
5Multiplying Large Numbers Th HTO1235x1 17Step 3: 5 x 2 = 10. Add the carried 1 makes 11.So: 235 x 5 = 1,175
6Multiplying Large Numbers Remember to line up the ones, tens and hundreds underneath each other.
7Multiplying Large Numbers Now have a look at the equation:255 x 25HTO25x
8Multiplying Large Numbers First, multiply 255 by the unit digit 5.Step 1: 5 x 5 = 25. Put the 5 in the units column, and carry the 2 to the tensHTO25x
9Multiplying Large Numbers Step 2: 5 x 5 = 25. Add the 2 makes goes into the tens column and carry the 2 to the hundred’s column.HTO25x7
10Multiplying Large Numbers Step 3: 5 x 2 = 10. Add the carried 2 makes 12.Th HTO25x1 27
11Multiplying Large Numbers Then multiply 255 by the ten’s digit 2. Remember to place a zero in the ones column first when multiplying the tens.Th HTO25x1 27
12Multiplying Large Numbers Th HTO125x1 27Step 1: 2 x 5 = 10. Put the 0 in the ten’s column, and carry the 1 to the hundreds.
13Multiplying Large Numbers Step 2: 2 x 5 = 10. Add the carried 1 makes goes into the hundred’s column, with 1 carried to the thousands.Th HTO125x1 27
14Multiplying Large Numbers Step 3: 2 x 2 = 4, add the carried 1 makes 5. The total is 5,100.Th HTO125x1 275 1
15Multiplying Large Numbers Finally, add down the columns down to get the total.Th HTO125x1 275 16 3So: 255 x 25 = 6,375
16Multiplying Large Numbers Remember:Keep the numbers in columns -ones, tens, hundreds etc. When multiplying the tens digitadd a zero to the ones columnfirst.