Multiply by 2-digit numbers: complete the missing steps
key notes :
β¨ Key Idea: |
When multiplying by a 2-digit number, we break the number into tens and ones, multiply separately, and then add the results.
πΉ Steps to Multiply by 2-Digit Numbers: |
- Write the numbers in columns (ones under ones, tens under tens).
- Multiply the ones digit of the 2-digit number with the top number.
- Write the result in the first row.
- Multiply the tens digit of the 2-digit number with the top number.
- Remember to place a zero (0) at the end (since itβs in the tens place).
- Add the two partial products to get the final answer.
πΉ Example 1: |
Multiply 236 Γ 24
Step 1: Multiply by the ones digit (4):
236 Γ 4 = 944
Step 2: Multiply by the tens digit (20):
236 Γ 20 = 4720
Step 3: Add the results:
944
+4720
-----
5664
β Final Answer: 5664
πΉ Example 2 (Fill in the missing step): |
Multiply 154 Γ 23
Step 1: Multiply by the ones digit (3):
154 Γ 3 = 462
Step 2: Multiply by the tens digit (20):
154 Γ 20 = ______
π Missing step: 3080
Step 3: Add the results:
462
+ 3080
------
3542
β Final Answer: 3542
π Practice Problems (with blanks to fill): |
- 128 Γ 34
- 128 Γ 4 = ______
- 128 Γ 30 = ______
- Final Answer = ______
- 215 Γ 46
- 215 Γ 6 = ______
- 215 Γ 40 = ______
- Final Answer = ______
π Tips for Students: |
- Always keep numbers lined up correctly (ones under ones).
- Donβt forget the zero when multiplying by the tens place.
- Check your addition carefully to avoid mistakes.
Learn with an example
π Fill in the missing number:

The first step is missing. Multiply by the ones to find the missing number.

The missing number is 8,188.
π Fill in the missing number:

The second step is missing. Multiply by the tens to find the missing number. Remember to write the zero at the end.

The missing number is 1,620.
π Fill in the missing number:

The final step is missing. Add the first two steps to find the missing number.

The missing number is 4,560.

Let’s practice!