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The student carries correctly inside a row and handles a multiplier that contains a zero without losing a place.
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Multiply first, then add the carry - the opposite order from addition.
Every row of our multiplication examples involves carrying, but how exactly does it work here?
When a digit of the multiplicand times the multiplier digit comes to ten or more, the ones digit of that answer stays in the column, and the rest is carried to the next column on the left.
Step 1 of the page 33 example, slowed right down.
Problem. Find the product of the first row for .
Worksheet 1 question 3(c), with every carry blanked.
To solve , start with the ones digit: . Multiply to get 6. Multiply to get 24, write 4 and carry 2. Multiply to get 27, add the carried 2 to get 29, making the entire first row . For the tens row, the multiplier is 30, so write a zero and multiply by 3 again to get . For the hundreds row, the multiplier is 100, so write two zeros and multiply by 1 to get . Finally, add all the rows together to get the total product of .
The zero step gives nothing, but its place must still be counted.
When a multiplier contains a zero, you split it just like usual. For example, splits into .
731 times 307 laid out two ways, one of which loses a place.
One single wide illustration divided down the middle by a thin vertical rule, showing two column multiplications side by…
Worksheet 1 question 1(f), where the multiplier is 307.
Problem. Find the product of .
Worksheet 1 question 2(c), where the multiplier is 340.
Problem. Find the product of by .