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Super Shapes

Stage: 2 Short Challenge Level: Challenge Level:1

Each of the following shapes has a value:

 

green triangle $= 7$ orange rectangle. $= 17$ red circle. $= \; ?$

The value of the circle changes in each of the following problems.
Can you discover its value in each problem, if the value of the shapes are being added together?

(a) $= 25$
(b) $= 51$
(c) $=136$
(d) $=48$
(e) $=100$


The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
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NRICH is part of the family of activities in the Millennium Mathematics Project.