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 Subtract Single-digit Numbers, Counting by 1s Create your own problem! Now solve it! Addition and Subtraction 4 There were 8 children on the bus. 3 children got off. How many children left on the bus? There were 9 children on the bus. 4 children got off. How many children left on the bus? There were 10 children on the bus. 7 children got off. How many children left on the bus?

3. Problem Solving Subtract Single-digit Numbers, Counting by 1s Create your own problem! Now solve it! Addition and Subtraction 4 Matt found these shells at the beach. He gave 3 shells to Kelly. How many shells does Matt have left? Matt found these shells at the beach. He gave 2 shells to Kelly. How many shells does Matt have left? Matt found these shells at the beach. He gave 7 shells to Kelly. How many shells does Matt have left?

4. Problem Solving Subtract Single-digit Numbers, Counting by 1s Create your own problem! Now solve it! Addition and Subtraction 4 In a basketball game, the Blues scored 12 goals and the Reds scored 4 goals. How many more goals did the Blues score? In a basketball game, the Blues scored 18 goals and the Reds scored 7 goals. How many more goals did the Blues score? In a basketball game, the Blues scored 14 goals and the Reds scored 8 goals. How many more goals did the Blues score?

5. Addition and Subtraction 4 Problem Solving Subtract Single-digit Numbers, Counting by 1s

6. Problem Solving Subtract Single-digit Numbers, Counting by 1s Create your own problem! Now solve it! Addition and Subtraction 4 Alex needs 13 chairs for him and his friends. This room has 7 chairs and the room next door has 4. How many more chairs does Alex need? Alex needs 17 chairs for him and his friends. This room has 8 chairs and the room next door has 4. How many more chairs does Alex need? Alex needs 19 chairs for him and his friends. This room has 7 chairs and the room next door has 6. How many more chairs does Alex need?

7. Problem Solving Subtract Single-digit Numbers, Counting by 1s Create your own problem! Now solve it! Addition and Subtraction 4 This room has 7 chairs. 3 children sit on the chairs. How many chairs have no one sitting on them? This room has 13 chairs. 8 children sit on the chairs. How many chairs have no one sitting on them? This room has 17 chairs. 4 children sit on the chairs. How many chairs have no one sitting on them?

8. Problem Solving Subtract Single-digit Numbers, Counting by 1s Create your own problem! Now solve it! Addition and Subtraction 4 This room has 7 chairs. 10 children want to sit down. How many more chairs will they need? This room has 6 chairs. 10 children want to sit down. How many more chairs will they need? This room has 3 chairs. 9 children want to sit down. How many more chairs will they need?

9. Problem Solving Subtract Single-digit Numbers, Counting by 1s Create your own problem! Now solve it! Addition and Subtraction 4 There were 14 children on the bus. A little while later there were 7 children on the bus. What could have happened? There were 19 children on the bus. A little while later there were 7 children on the bus. What could have happened? There were 16 children on the bus. A little while later there were 4 children on the bus. What could have happened?