write the steps to perform multiplication using a formula class 9 computer
Answers
Answer:
To write a formula that multiplies two numbers, use the asterisk (*). To multiply 2 times 8, for example, type “=2*8”. Use the same format to multiply the numbers in two cells: “=A1*A2” multiplies the values in cells A1 and A2.
We need to find the answer to the calculation 23 × 14.
First write your numbers in columns representing hundreds, tens and units (See our Numbers page for help).
Hundreds Tens Units
2 3
1 4
Step 1: Starting in the right-hand column (units) multiply 4 and 3. You can refer to the multiplication table above if needed. Write the answer (12) underneath your calculation, taking care to put the 1 in the tens column and the 2 in the units column.
The blue numbers are the ones we are currently working on and the pink numbers are the first part of our answer.
Hundreds Tens Units
2 3
1 4
1 2
Step 2: Next we multiply the 4 by the next number across, which is 2 (or 20, because it is in the tens column). Write your answer underneath in the tens column: We write 8 in the tens column (4 times 2 tens) and zero in the units column (4 times 2 tens is the same as 4 × 20 = 80).
Hundreds Tens Units
2 3
1 4
1 2
8 0
Step 3: In the steps above, we have multiplied the units of the bottom number (4) by the top number (23). Next we need to multiply the tens in the bottom number (1) by the top number (23). Now we are working with the digit in the tens column of the bottom number and we repeat the steps above. Looking back at our basic rules of multiplication above, we know that when we multiply a number by 10, we write a zero at the end. In this step, because we have moved over a column and we are working in tens, we must remember to write zeros in the first (units) column.
Work out 1 × 3. As above, we write our answer (3) in the tens column and (0) in the units column.
Hundreds Tens Units
2 3
1 4
1 2
8 0
3 0
Step 4: The final multiplication we need to perform is 1 × 2. Both the numbers are in the tens column, so we are multiplying one lot of 10 by two lots of 10. Using the rules we have learned in the previous steps, we need to write a zero in the units column and a zero in the tens column. Our answer (1 × 2 = 2) is written in the hundreds column, because we have actually calculated 10 × 20 = 200.
Hundreds Tens Units
2 3
1 4
1 2
8 0
3 0
2 0 0
Stage 5: At this stage we have finished our multiplications; the only step that remains is to add up all our answers (pink numbers) to find the total number of sandwiches needed. See our Addition page if you need help with adding up numbers.
Hundreds Tens Units
2 3
1 4
1 2
8 0
3 0
2 0 0
Total: 3 2 2
12 + 80 + 30 + 200 = 322. We have calculated that Lisa needs to make a total of 322 sandwiches.
The above example shows how to perform a multiplication split into all possible parts, but as confidence improves it is possible to skip steps.