Addition Subtraction Aim Analyse which method of addition

Addition & Subtraction. Aim; Analyse which method of addition/ subtraction you prefer. Outcome; 3 - Able to use more than one method. 4 - Able to explain why you prefer that method. Starter; Put these into order starting with the lowest number first. -12 -4 21 5 36 3 176 17. 6

Using partitioning to add What is 276 + 68? 276 + 68 = 200 + 70 + 60 + 8 = 6 + 8 + 70 + 60 + 200 = 14 + 130 + 200 = 344 What is 63. 8 + 4. 7? 63. 8 + 4. 7 = 60 + 3 + 0. 8 + 4 + 0. 7 = 0. 8 + 0. 7 + 3 + 4 + 60 = 1. 5 + 7 + 60 = 68. 5

Adding by counting up What is 276 + 68? 276 + 60 +8 = 344 + 60 +8 276 336 344 What is 63. 8 + 4. 7? 63. 8 + 4 + 0. 7 = 68. 5 +4 63. 8 + 0. 7 67. 8 68. 5

Using compensation to add What is 276 + 68? 276 + 70 – 2 = 344 – 2 + 70 276 344 346 What is 63. 8 + 4. 7? 63. 8 + 5 – 0. 3 = 68. 5 +5 63. 8 – 0. 3 68. 5 68. 8

Tasks. • Complete the questions from text book, page 3, • Q 1 -4 • Extension; • Draw 3 diagrams to explain how each method works.

Subtraction. Aim; Explore different ways to subtract numbers. Outcome; 3 - Able to use one method well 4 - Able to use more than one. Starter; Add these numbers together using any method we learnt on Friday. 124 + 56 254 + 44 95 + 12 3554 + 14

Using partitioning to subtract What is 564 – 437? 564 – 400 – 30 – 7 = 127 – 7 127 – 30 134 – 400 164 564

Subtracting by counting up What is 564 – 437? 100 + 3 + 20 + 4 = 127 + 100 437 +3 537 540 + 20 +4 560 564

Using compensation to subtract What is 564 – 437? 564 – 500 + 63 = 127 + 63 64 – 500 127 564

Tasks. • Complete the following questions; • Collect a laptop or log onto a computer, and go to the following website address; http: //bbc. in/mrhodges 1 (work through the whole number activity. • Level 3 only; http: //bit. ly/mrhodges 2 • Level 4 only; http: //bbc. in/mrhodges 3 do 3 numbers to extend yourself.

Plenary. • Write down what you understand from these words; • Partitioning • Counting on