Associative Property
How could you solve this in two different ways?
3 x 3 x 4
9x4=36
or
3x12=36
How can place value help you solve 4 x 60?
4x6 tens=
24 tens=
240!
7 x 6=?
42 so it's EVEN
How can double help you solve 4x6?
2x6 + 2x6
12+12=24
or
4x3 + 4x3
12 + 12=24
During the first 7 hours of a snowstorm, a weather station recorded 4 inches of snow each hour. Before the snowstorm ended, 12 more inches of snow fell. How many inches of snow fell?
40 inches
How can you solve 4x2x2 in two different ways?
8x2=16
or
4x4=16
How can place value help you solve 6x30?
6x3 tens=
18 tens=
180!
9x3=?
27 so it's ODD
How can doubles help you solve 7 x 4?
7x2 + 7x2
14+14
28
Miss Aldrich and Miss Jackson are planting a garden. They are buying 4 packages of tulip bulbs for $7 each. They want to split the cost equally between the 2 of them. How much does each person pay?
$14
How could you solve 2x4x3 in two ways?
8x3=24
or
2x12=24
How can place value help you solve 7x40?
7x4 tens=
28 tens=
280!
2x8=?
18 so it's EVEN
How can doubles help you solve 8x7?
4x7 + 4x7
28+28
56
Mr. Deloria puts books on the shelves in his classroom. He puts 10 rows of 4 books on each shelf. He puts books on 3 shelves. How many books does Mr. Deloria put on shelves in all?
120 books
How could you solve 6x3x2 in two different ways?
18x2=36
or
6x6=36
How can place value help you solve 9 x 60?
9x6 tens=
54 tens=
540!
3x5=?
15 so it's ODD
How can doubles help you solve 6x9?
3x9+3x9
27+27
54
Miss Lesniak is setting plates out for our class party. She places plates in 5 rows with 9 plates in each row. She hands out 21 of the plates. How many plates are still left to be handed out?
24 plates left
How can you solve 9x3x2 in two different ways?
27x2=54
or
9x6=54
How can place value help you solve 9x80?
9x8 tens=
72 tens=
720!
8x8=?
64, so it's EVEN
How can doubles help you solve 12 x 7?
6 x 7 + 6x7
42+42
84
Well 8 x 9 is close to 8x10, which is 80. And 64 is close to 60! So if I do 80 + 60= 140. 140 is very close to 136, so his answer is reasonable!