Why A decade counter is a divide-by-10 frequency divider: it counts input pulses from 0 through 9 and then rolls over, generating one carry/output pulse for every ten pulses at its input. "Decade" means ten, so the output frequency is the input frequency divided by 10. Cascading decade counters gives divide-by-100, divide-by-1000, and so on, which is how frequency counters build their decimal display chain.
Watch out The choices about driving a seven-segment display describe a BCD-to-seven-segment decoder/driver, a separate chip that often follows a decade counter; and no simple counter multiplies pulses, so producing 10 outputs per input is backwards.
Decade = 10. Counters divide, never multiply: 10 in, 1 out.