Multiplication Magic
We are learning to use place value to solve multiplication problems using whole numbers.
Times Table practice:
15 x 5 = 75
17 x 12 = 204
16 x 16 = 256
9 x 9 = 81
6 x 6 = 36
A factor is: numbers that multiply to make that number. A factor of 12 is 6.
A factor of 24 is 12, 2, 24, 1
A multiple is: times tables
Multiples of 6 are 6, 12, 18, 24, 30, 36, 42, 48
A prime number is: A prime number is a whole number greater than 1. It can only be divided by itself 1
The first 3 prime numbers are: 2, 3, 5
A Triangle number is:
The first 3 triangle numbers are: 1, 3, 6
(Work shop)
18 x 22 = 396
134 x 12 = 1608
135 x 122 = 16470
145 x 124 = 17980
177 x 155 = 27435
(Work shop)
Magic time!
12 x 7 = 84
6 x 14 = 84
What do you notice? They had the same answer
18 x 2 = 36
9 x 4 = 36
What do you notice? They had the same answer
If your teacher asks you to solve 22 x 3, how could you change this to a times table you already know?
22 / 2 = 11
3 x 2 = 6
11 x 6 = 66
21 x 6 = 126
7 x 18 = 126
What do you notice? They had the same answer
24 x 9 = 216
8 x 27 = 216
Why has this happened? Because they are both multiples of 3
If your teacher asks you to solve 33 x 3, how could you change this to a times table you already know?
33 / 3 = 11
3 x 3 = 9
9 x 11 = 99
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