plus and minus keys on wireless keyboard?

hi there everyone. i've got a new aluminum wireless keyboard and i love it to bits. gorgeous bit of design and elegance. on the previous apple keyboard however there was a couple of handy keys next to the numeric pad for 'plus' and 'minus'. Does anyone know how i can find these on the wireless keyboard? these were particularly handy when hit with the 'command' key to increase or decrease the size of text in safari.