### Subtraction

 Learning Focus/Learning Objectives Counting Strategies. (See Mathematics Developmental Continuum Addition and Subtraction Progression Points) Vocabulary: Adding, Addition, Counting on, counting up, 100’s chart, open number line, more, less, same, total, sum, Subtraction, minus, counting back, counting backwards, difference. Warm Up Game Whole Class Introduction Student Activity Share/Reflection 5 mins 10 mins 25 - 35 Monday Roll to 0 (100’s Chart) Check counting on and knowledge of numbers. Record student understandings. (Start at 100 and count down) I went fishing on the weekend with my Mum. We caught 10 but threw 3 back. How many did we have? Model on 100’s chart, Open # line and # sentence. You went fishing. How many did each person catch, how many did you throw back and how many fish did you end up with?  P/N/W Discuss strategies. How did they use the 100’s chart, Open # line and # sentence. Tuesday 10 rolls. Highest total wins. Write # sentence. 2+4+1+5......=27 When I opened my bag of lollies last night I counted 15 lollies. My friend ate 6. How many lollies were left? I bought a bag of 50 lollies. I gave a different amount to each of my family. How many lollies did I have left?  P/N/W Discuss strategies. How did they use the 100’s chart, Open # line and # sentence. Wednesday Skip Counting. Around the World. Discuss counting by 3’s. (3,6,9,2,5,8,1,4,7,0) Play  counting by 3’s until you get around the whole class twice. My fish tank holds 100 litres. I put 50 litres in my pool and drank 4 litres. How much water was left? What else could I have used the water for? How much water was left in your fish tank? Show how much you had and how much you used for each and how much was left for the fish.  P/N/W Discuss strategies. How did they use the 100’s chart, Open # line and # sentence. Thursday Greedy Pig I had \$25 and gave \$5to my brother and \$6 to my sister. How much money did I have left? You had\$100 to share with your friends. You gave each person a different amount. How much did you have left? Draw a table. Write the number sentence. Share. What if there were 1000? Friday Roll to 0. I went to the zoo on the weekend. I counted 37 snakes, then 12 escaped. How many snakes were left? When you went to the zoo a whole lot of animals escaped. How many were there, how many escaped of each type and how many were left? P/N/W Share solutions. Discuss words associated with subtraction. Create word bank..

Addition and Subtraction - Progression Points