"number of times" is a grammatically correct phrase and can be used in written English. For example, "I've failed the test a number of times before, so this time I'm determined to do better.".
Number of times read: Four.
It happened a number of times.
I crashed a number of times".
He got hit a number of times.
"They fired him a number of times".
"It's not fair a number of times.
Repeat the test a number of times.
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MA of Applied Linguistic, Maquarie University, Australia