Addition Subtraction Crossing 10 1 Subtraction Crossing 10
Addition & Subtraction – Crossing 10 (1) Subtraction – Crossing 10 (2) Block 1 – Week 3
Lesson 1 Step: Subtraction – Crossing 10 (1)
Fluency 12 - 3 = 9 -3 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Fluency 16 - 7 = 9 -7 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
14 - 6 = 8 -6 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Fluency First there were 11 apples. Then 4 were taken away. How many now? 11 - 4 = 7 -4 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Fluency First there were 17 cherries. Then 9 were taken away. How many now? 17 - 9 = 8 -9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Fluency First there were 12 pears. Then 7 were taken away. How many now? 12 - 7 = 5 -7 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Beth says, The number line represents the subtraction problem. -4 0 1 2 3 4 5 6 7 8 9 10 Do you agree with Beth? Explain your answer No, the number line shows 13 – 4 = 9. It should show 13 – 5 = 8. 11 12 13 14 15 16 17 18 19 20
Problem solving 12 pencils. First there were ______ Then 7 were taken away. Now there are 5. Show this on ten frames.
- Slides: 10