Upload
caroline-moody
View
214
Download
0
Tags:
Embed Size (px)
Citation preview
What’s It All About?
You are going to learn:
How to multiply two whole numbers.
What skills should you have already?
You need to be able to multiply up to 9 9 and add single digit numbers.
Multiplication Using Lattice Demo
Calculate 572 × 14
Draw a box.
You need three squares across and two squares down.
Because 5 7 2 has three digits and 1 4 has two digits…
Cut each square diagonally in half. Write the numbers to be multiplied around the top and right edges.
Use a highlighter pen to highlight every other diagonal stripe.
5 7 2
Multiplication Using Lattice Demo
1
4
Multiply the digits at the top and right of each cell and write the answer in the cell.
5 7 2
Multiplication Using Lattice Demo
1
4
0 5
0 7
0 2
2 0
2 8
0 8
Ten Thousands
Thousands
UnitsHundredsTensThe digits in each diagonal stripe all have the same place
value...
Add up each stripe. Write the total for each stripe at the end of the stripe.
5 7 2
Multiplication Using Lattice Demo
1
4
0 5
0 7
0 2
2 0
2 8
0 8
Ten Thousands
Thousands
UnitsHundredsTensNow we add up the digits, starting with the units
corner...
Add up each stripe. Write the total for each stripe at the end of the stripe.
5 7 2
Multiplication Using Lattice Demo
1
4
0 5
0 7
0 2
2 0
2 8
0 8
0 8 0
8
0
11
Always write down your answer... 572 × 14 =
8008
Question 2 (with answer)
Calculate 152 × 34
1 5 2
3
4
0 3
1 5
0 6
0 4
2 0
0 8
0
5
6 81
1
152 × 34 = 5168
Question 3 (with answer)
Calculate 237 × 14
2 3 7
1
4
0 2
0 3
0 7
0 8
1 2
2 8
0
3
1 83
1
237 × 14 = 3318
1