page16
# Copyright © Mathematics Mastery 2017
Parental Guidance
In this unit, pupils multiply and divide using mental methods and are first introduced to written short methods of multiplication and division. This week, pupils have been using short multiplication to multiply 2-digit and 3-digit numbers by 1-digit numbers.
Short multiplication
What pupils will write: What pupils will draw: What pupils will say:
Unit 3: Multiplication and division (Week 2 of 3)
Parental Guidance
In this unit, pupils multiply and divide using mental methods and are first introduced to written short methods of multiplication and division. This week, pupils have been using short multiplication to multiply 2-digit and 3-digit numbers by 1-digit numbers.
Short multiplication
What pupils will write: What pupils will draw: What pupils will say:
3
4
1
x
4
341 is three hundreds, 4 tens and 1 one.
Thousands
Hundreds
Tens
Ones
100
100
100
10
10
10
1
10
3
4
1
x
4
4
1 one multiplied by four is equal to four ones.
Thousands
Hundreds
Tens
Ones
4
100
100
100
10
10
10
1
10
1
1
1
3
4
1
x
4
6
4
1
4 tens multiplied by four is equal to 16 tens. That’s the same as one hundred and six tens. I need to regroup 10 tens for 1 hundred. There are now 6 tens in the tens column.
Thousands
Hundreds
Tens
Ones
6
4
100
100
100
10
1
10
1
1
1
10
10
10
10
100
1
3
4
1
x
4
1
3
6
4
1
3 hundreds multiplied by 4 is equal to 12 hundreds. I also need to add the regrouped one hundred, so there are 13 hundreds altogether. I need to regroup 10 hundreds for one thousand. There are 3 hundreds lefts in the hundreds column.
Thousands
Hundreds
Tens
Ones
6
4
1000
100
100
10
1
10
1
1
1
10
10
10
10
100
1