Mada za sehemu hiiUse numerical operations in everyday lifeMada 1
- Multiplication and division of whole numbers
Multiplication and Division of Whole Numbers
Multiplication and division are two important operations we use every day. Multiplication is a quick way of adding equal groups together. Division is the process of sharing equally or finding how many times one number fits into another.
- Multiplicand – the number being multiplied
- Multiplier – the number we multiply by
- Product – the answer in multiplication
- Dividend – the number being divided
- Divisor – the number we divide by
- Quotient – the answer in division
- Remainder – what is left over when division is not exact
Multiplying Two-Digit Numbers by a One-Digit Number
Example:
| Step | Calculation |
|---|---|
| 1. Multiply the ones: | (write 8 in ones place) |
| 2. Multiply the tens: | (write 4 in tens place, regroup 2 to hundreds) |
Answer:
Multiplying Two-Digit Numbers by a Two-Digit Number
Example:
| Step | Calculation |
|---|---|
| 1. Multiply by the ones (2): | |
| 2. Multiply by the tens (10): | |
| 3. Add the results: |
Answer:
Multiplying Three-Digit Numbers
Example:
| Step | Calculation |
|---|---|
| 1. Multiply by the ones (3): | |
| 2. Multiply by the tens (10): | |
| 3. Add the results: |
Answer:
Steps for Vertical Multiplication
- Write the numbers vertically, aligning digits by place value
- Multiply starting from the right (ones), then tens, hundreds
- Write each product in the correct place
- Regroup when needed (10 ones = 1 ten, 10 tens = 1 hundred)
- Add all the partial products
Division Without Remainder (Short Method)
Example:
| Step | Calculation |
|---|---|
| 1. Divide the tens: | (write 3 in tens place) |
| 2. Divide the ones: | (write 4 in ones place) |
Answer:
Division Without Remainder (Long Method)
Example:
| Step | Calculation |
|---|---|
| 1. Divide: | (write 2 above tens) |
| 2. Multiply: | , subtract: |
| 3. Bring down: | Bring down 9 ones |
| 4. Divide: | (write 3 above ones) |
| 5. Multiply: | , subtract: |
Answer:
Division With Remainder
Example:
| Step | Calculation |
|---|---|
| 1. Divide tens: | ten, remainder 2 tens |
| 2. Combine with ones: | |
| 3. Divide: | , remainder 4 |
Answer: remainder (or )
Steps for Long Division
- Divide the leftmost digit(s) by the divisor
- Write the quotient above
- Multiply the quotient by the divisor
- Subtract and bring down the next digit
- Repeat until all digits are divided
- Write the remainder if any
Multiplication Problem
A school bought 5624 crates of soda. Each crate had 24 bottles. How many bottles were bought in total?
Solution: bottles
Division Problem
Thirteen farmers shared 1,625 chickens equally. How many chickens did each farmer get?
Solution: chickens each
Division With Remainder Problem
A teacher had 305 oranges and shared them equally among 35 pupils. How many oranges did each pupil get, and how many remained?
Solution: remainder
Each pupil received 8 oranges, and 25 oranges remained.
In Tanzania, you use multiplication and division every day. For example, when Mamasita buys 15 rows of bricks for building a house, and each row has 24 bricks, she multiplies to know the total bricks she bought. Similarly, if a farmer harvests 2,400 kilograms of maize and wants to store them equally in 8 sacks, he divides kilograms per sack to share the harvest fairly.
Swali
What is the product of 41 and 9?
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