Doubling and halving

Doubling and halving facts to 20.
What T is half of 4?. What F is half of 8. What S is half of 12?. What E is half of 16?. What T is half of twenty?. What T is double one?. What F is double two?. What S is double three?. What E is double four?. What T is double five?. What T is double six?. What F is double seven?. What S is double eight?. What E is double nine?. What T is double ten?. What N is half of eighteen?. What S is half of fourteen?. What F is half of ten?. What T is half of six?. What O is half of two?.

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