1. Implementation 1.Review the mathematical concept. 2.Review the problem solving steps. 3.READ: Children read the part that is asking them to find something out. 4.UNDERSTAND: Children explain what they need to find out. 5.Children identify what information they will need to find it out. 6.Remove the coloured rectangle. 7.Children find the information they need to find it out. 8.CHOOSE A STRATEGY: Children identify strategies that they could use to find it out. 9.USE A STRATEGY: Children use a strategy to find it out. 10.Children record their thinking as they find it out. 11.CHECK: Children reread the part that asked them to find something out. 12.Children check that they have found it out. 13.Children check they have recorded their solution correctly. 14.Children follow the problem solving steps to solve the 2 nd level of the problem, with minimal teacher guidance. 15.Children who solve the 2 nd level, follow the problem solving steps to solve the 3 rd level of the problem independently. 16.Children use the problems as a guide to create their own problem, either alone or in pairs/small groups. 17.Children solve their own problem. Throughout the lesson, children share solution strategies. At the end of the lesson, children explain how they created their own problems.

2. Problem Solving Identify and Classify Angles Create your own problem! Now solve it! Measurement and Geometry 66 Toby measured an angle on a straight line as 125ᴼ. What is the size of the remaining angle? Toby measured an angle on a straight line as 27ᴼ. What is the size of the remaining angle? There were 3 angles on a straight line. The sum of two of the angles is 132ᴼ. What is the size of the remaining angle?

3. Problem Solving Identify and Classify Angles Create your own problem! Now solve it! Measurement and Geometry 66 Tim measured an angle in a right angle as 65ᴼ. What is the size of the remaining angle? Tim measured an angle in a right angle as 14ᴼ. What is the size of the remaining angle? There were 3 angles in a right angle. The sum of two of the angles is 78ᴼ. What is the size of the remaining angle?

4. Problem Solving Identify and Classify Angles Create your own problem! Now solve it! Measurement and Geometry 66 Bette measured an angle in a revolution as 65ᴼ. What is the size of the remaining angle? There were 3 angles in a revolution. The sum of two of the angles is 278ᴼ. What is the size of the remaining angle?

5. Problem Solving Identify and Classify Angles Create your own problem! Now solve it! Measurement and Geometry 66 During a single leap, a dancer made 2 and a half full rotations of his body. By how many degrees did the dancer rotate his body in this leap? Alex tried to turn a revolution in a single leap. He only managed to turn 325ᴼ. How many more degrees did he need to turn to turn a revolution?

6. Toby drew two intersecting lines and measured one of the angles. It was 65ᴼ. What is the size of the vertically opposite angle? Problem Solving Identify and Classify Angles Create your own problem! Now solve it! Measurement and Geometry 66 Toby drew two intersecting lines and measured one of the angles. It was 135ᴼ. What is the size of the vertically opposite angle?

7. Bobby drew two intersecting lines and measured one of the angles. It was 65ᴼ. What is the size of the vertically adjacent angle on the straight line? Problem Solving Identify and Classify Angles Create your own problem! Now solve it! Measurement and Geometry 66 Bobby drew two intersecting lines and measured one of the angles. It was 120ᴼ. What is the size of the vertically adjacent angle on the straight line?

8. Barbara drew two intersecting lines and measured one of the angles. It was 65ᴼ. What was the sum of the other angles? Problem Solving Identify and Classify Angles Create your own problem! Now solve it! Measurement and Geometry 66 Barbara drew two intersecting lines and measured one of the angles. It was 145ᴼ. What was the sum of the other angles?

9. The sum of four angles around a point is 360°. Two of these angles each measure 95ᴼ. What is the size of each of the other two angles? Problem Solving Identify and Classify Angles Create your own problem! Now solve it! Measurement and Geometry 66 The sum of four angles around a point is 360°. Two of these angles each measure 40ᴼ. What is the size of each of the other two angles?