Family Maths Challenge 8

Family Maths Challenge 8 – STEPPING UP This stairway is made of cubes. How many cubes would be needed to make the steps 9 steps high?

ANSWER

45

HOW I WORKED IT OUT

I drew all the stairs up to 9 and counted them all up.I also thought 9+1=10 8+2=10 7+3=10 6+4=10 so that equils 40 with 5 left over so it is 45