A spoke of an abacus can have maximum _____ beads.    

$84$

Write the number name.

$46$

Write the number name.

$90$

Write the number name.

$79$

a) My house number is a $2$-digit number.

b) The digit at it tens place is the smallest odd number.

c) The digit at its ones place is a number which when added to a number or subtracted from a number gives the number itself.