A child plans to raise money by producing and selling a calendar of community events. The child will produce 1,000 calendars which he plans to sell for $10 each. The cost of producing and marketing the calendars will be $1.50 each. The child will have to sell ____________________ to break even.
The total cost of producing and marketing 1,000 calendars is 1,000 * $1.50 = $<<1000*1.5=1500>>1,500.
To break even, the child needs to sell calendars worth $1,500, which is $1,500 / $10 = <<1500/10=150>>150 calendars. Answer: \boxed{150}.