You're almost at the point of choosing your preferred method, but before that, you need to know how to estimate your answers, because there's nothing more embarrassing than guessing that the answer to 40 x 30 (40 groups, with 30 people in each group) is 12.
So, let's get that right first:
There's another trick you can use too:
If 4 x 6 = 24.
Then 40 x 6 = 240
OR 4 x 60 = 240.
3 x 5 = 15
3 x 50 = 150
30 x 5 = 150
6 x 8 = 48
6 x 80 = ?
60 x 8 = ?
5 x 5 = 25
5 x 50 = ?
50 x 5 = ?
6 x 6 =
6 x 60 =
60 x 6 =
3 x 9 =
3 x 90 =
9 x 30 =
5 x 6 = 30
5 x 60 = 300
5 x 600 = 3,000
5 x 6,000 = 30,000
Mission: Estimate the answers to these three equations, then solve them using the method shown in the above clip or using the method in the trick above.
1. 4 groups of 506
2. 6 groups of 297
3. 809 groups of 5
So, let's get that right first:
There's another trick you can use too:
If 4 x 6 = 24.
Then 40 x 6 = 240
OR 4 x 60 = 240.
3 x 5 = 15
3 x 50 = 150
30 x 5 = 150
6 x 8 = 48
6 x 80 = ?
60 x 8 = ?
5 x 5 = 25
5 x 50 = ?
50 x 5 = ?
6 x 6 =
6 x 60 =
60 x 6 =
3 x 9 =
3 x 90 =
9 x 30 =
5 x 6 = 30
5 x 60 = 300
5 x 600 = 3,000
5 x 6,000 = 30,000
Mission: Estimate the answers to these three equations, then solve them using the method shown in the above clip or using the method in the trick above.
1. 4 groups of 506
2. 6 groups of 297
3. 809 groups of 5
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