The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics. The blog presenting the Math Concept, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn the skills to deal with Math Modeling, Math Problem Solving and Problem Sum from Lower Primary School to Upper Primary School level after reading the blog postings. This posting is an upper primary school math question on Angle and Shape.

Read the posting on **Sarin learns Lines and Angles (Math concept)** to understand the concept of lines and angles. Read also the posting on **Sarin learns Shapes and Solids in school (Math Concept)** to know about shapes.

**Upper primary school mathematics question UPQ300**

The figure below is not drawn to scale. ABCD and AEFG are two indentical squares and ∠ DAG = 60^{0}. CEHG is a straight line. Find ∠ GHD and ∠ ECD.

*Solution: *

AEFG is a square

AG = AE and GE form the bi-sector of ∠ AGF

∠ AGH = 90^{0 }÷ 2 = 45^{0}

∠ GHD = 45^{0} + 60^{0} = 105^{0}

ABCD is a square

∠ ADC = 90^{0}

∠ ECD = 105^{0} – 90^{0} = 15^{0}