There are 2,135 dance platforms. Each platform has 2 folk dancers and 4 dancers each on the four sides.
How many dancers have participated in all?
1. Multiply 2,135 by 8 ones.
2. Multiply 2,135 by 1 ten or 10.
3. Regroup the results as necessary.
4. Add all the partial products to get the final product.
∴ 2,135 × 18 = 38,430
Hence, total number of dancers on the platform is 38,430.