Alright, let's work through 2448 times 213 step by step
2448 × 213 = 213 × (2448)
+ 213 × 8 that equals 1704
+ 213 × 40 which equals 8520
+ 213 × 400 what gives us 85200
+ 213 × 2000 what gives us 426000

= 521424
