Multiplying 3-digit numbers by 1-digit numbers

1. multiply 3 digits by 1 digit

2. Starter
T O
Write a short multiplication to match the
counters.
T O
X

3. 243
Hundreds Tens Ones
486
2 times
243 × 2 = 486

4. Hundreds Tens Ones
130 × 3 =390
I think the answer is
390

5. 122 × 4 =
H T O
1 2 2
4
Hundreds Tens Ones
(2 × 4)
(20 × 4)
(100 × 4)
488
X

6. 121 × 4 =
H T O
1 2 1
4
Hundreds Tens Ones
X
Have a go….

7. Hundreds Tens Ones
H T O
2 4 2
x 4
10 10 10 10
100 100 1 1
10 10 10 10
100 100 1 1
10 10 10 10
100 100 1 1
10 10 10 10
100 100 1 1
How could we make this method more efficient?

8. Hundreds Tens Ones
H T O
x
100 1 1 1 1
100 1 1 1 1
100 1 1 1 1
1 0 4
3
Another one…

9. H T O
1 2 4
x 2
Your turn – have a go at calculating this
one your whiteboards…
Hundreds Tens Ones