Multiplication Lesson 2 Short Multiplication written method Home

What is Multiplication? Thinking Time questions ØWhat other words can we think for multiply?

What is short multiplication? • Short multiplication is how we calculate larger multiplication calculations

How do we use this method? What is 12 x 4? 1 2 ×

Let’s look at what this means using place value counters…. Then move onto the

Let’s try another calculation…. . What is 23 x 3? 2 3 × 3

A bit harder this time…. . What is 26 x 4? 1. First set

Have a go at this one…. 1. First set your calculation out correctly with

How did you get on? What is 34 x 4? 3 4 × 4

If you are completing Bronze or Silver activities. Now its your turn Download the

What do we do for 3 -digit numbers? 2. Multiply the ones digits 8

Have a go at these questions… • 134 x 6 = • 121 x

Did you get them right? • 134 x 6 = 1 3 4 x

Now it’s your turn Have a go at the Gold activities on the class

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Multiplication Lesson 2: Short Multiplication written method Home learning: Week 5 W/C: 18. 05. 2020

What is Multiplication? Thinking Time questions ØWhat other words can we think for multiply? Can you write them down? ØDo numbers get bigger or smaller? ØHow do we multiply numbers? ØWhat methods can we use?

What is short multiplication? • Short multiplication is how we calculate larger multiplication calculations and looks like this: 1 2 × 4 Remember - This calculation means 4 lots of 12. We can represent it using place value counters on a place value chart: The place value chart helps us to work it out – we can count the ones and then the tens

How do we use this method? What is 12 x 4? 1 2 × 4 4 8 12 x 4 = 48 1. First set your calculation out correctly with one number in each square. Use a ruler to draw the lines. 2. Multiply the ones digit. 2× 4=8 3. Write the answer in the ones column on the answer line. 4. Now calculate the tens. Multiply 1 by 4. 1 × 4 = 4.

Let’s look at what this means using place value counters…. Then move onto the tens: We have 4 lots of 1 ten 4 x 10 = 40 Start with the ones : We have 4 lots of 2 ones 4 x 2=8

Let’s try another calculation…. . What is 23 x 3? 2 3 × 3 6 9 23 x 3 = 69 1. First set your calculation out correctly with one number in each square. Use a ruler to draw the lines. 2. Multiply the ones digit by 3. 3 × 3 = 9. 3. Write this in the ones column. 4. Now calculate the tens. Multiply 2 by 3. 2 × 3 = 6.

Let’s look at what this means using place value counters…. Then move onto the tens: We have 3 lots of 2 tens 3 x 20 = 60 OR 6 x 10 = 60 Start with the ones : We have 3 lots of 3 ones 3 x 3=9

A bit harder this time…. . What is 26 x 4? 1. First set your calculation out correctly with one number in each square. Use a ruler to draw the lines. 2 6 × 4 1 0 4 2 26 x 4 = 104 2. Multiply the ones digit by 4. 6 × 4 = 24. 3. Write the 4 in the ones column. 4. Write 2 in the tens column underneath the answer line. We need to carry this over as this represents 20. 5. Now calculate the tens. Multiply 2 by 4. 2 × 4 = 8 6. Now add the 2 tens that you carried over 8 + 2 = 10

Let’s look at what this means using place value counters…. Then move onto the tens: We have 4 lots of 2 tens 4 x 20 = 80 OR 8 x 10 = 80 Then we add the answers 80 + 24 = 104 Start with the ones : We have 4 lots of 6 ones 4 x 6 = 24 Remember – 24 ones is the same as 2 Tens and 4 Ones

Have a go at this one…. 1. First set your calculation out correctly with one number in each square. Use a ruler to draw the lines. What is 34 x 4? 3 4 × 4 2. Multiply the ones digit 3. Write the answer in the ones column. 4. If there any tens to carry over – carry them underneath the answer line. 5. Now calculate the tens. 34 x 4 = 6. Now add any tens you have carried over

How did you get on? What is 34 x 4? 3 4 × 4 1 3 6 1 34 x 4 = 136 1. First set your calculation out correctly with one number in each square. Use a ruler to draw the lines. 2. Multiply the ones digits 4 x 4 = 16 3. Write the ones in the ones column. If there any tens to carry over – carry them underneath the answer line. 4. Now calculate the tens. 3 x 4 = 12 5. Now add any tens you have carried over 12 + 1 = 13

If you are completing Bronze or Silver activities. Now its your turn Download the worksheets from the class page and get multiplying! If you are completing Gold activities – read on a little further…. .

What do we do for 3 -digit numbers? 2. Multiply the ones digits 8 x 4 = 32 1. First set your calculation out correctly with one number in each square. 3. Write the ones in the ones column. Use a ruler to draw the lines. If there any tens to carry over – carry them underneath the answer line. What is 128 x 4? 1 2 8 x 4 5 1 2 1 3 4. Calculate the tens. 2 tens x 4 = 8 tens Now add any tens you have carried over 8 tens + 3 tens = 11 tens 6. This time we have another column – so we put 1 in the tens column and then carry over into the hundreds column. Put the 1 underneath the answer line. 7. Now we multiply the hundreds: 1 hundred x 4 = 4 hundreds 8. Lastly, we add the hundreds we carried over: 4 hundred + 1 hundred = 500

Have a go at these questions… • 134 x 6 = • 121 x 7= • 145 x 5 = Remember to follow the steps from the last slide to help you answer them

Did you get them right? • 134 x 6 = 1 3 4 x 6 8 0 4 2 2 121 x 7 = 1 2 1 x 7 8 4 7 1 145 x 5 = 1 4 5 x 5 7 2 5 2 2

Now it’s your turn Have a go at the Gold activities on the class page. Good luck!