The State Pension has changed, with effect from 6 April 2016. The full new State Pension, if you qualify for it, was set at £159.55 a week in 2017-18. The full basic State Pension for people who qualified for it and reached State Pension age before 6 April 2016 was set at £122.30 a week in 2017-18 (those not eligible might have qualified for a 'top up' through their spouse or civil partner's National Insurance contributions).
You can check current rates for the new State Pension and basic State Pension on the GOV.UK web sites below. The additional State Pension no longer exists, but any entitlement you accumulated before 6 April 2016 could affect the State Pension you receive under transitional arrangements. The easiest way to find out how much you are entitled to is to request a State Pension forecast.
You can find the current rates for the basic state pension on the GOV.UK website.