1) Which equation is shown on the number line below? a) 15 – 9 = 6 b) 15 – 6 = 9 c) 15 + 6 = 21 d) 9 – 6 = 3 2) Use the number line to subtract 15 - 8​. What are the correct steps? a) Start at 8. Count on 15. 15 – 8 = 23 b) Start at 15. Count back 8. 15 – 8 = 7 c) Start at 7. Count on 15. 15 – 7 = 22 d) Start at 15. Count back 7. 15 – 8 = 8 3) Jake uses a number line to solve 18 – 6. What are the correct steps?  a) Start at 6. Count on 18. 18 – 6 = 24 b) Start at 12. Count on 6. 18 – 6 = 18 c) Start at 18. Count back 6. 18 – 6 = 12 d) Start at 18. Count on 6. 18 – 6 = 24 4) Use the number line to find the difference. a) 4 b) 5 c) 6 d) 7 5) Make a 10 to subtract: 15 - 8 = ? a) 8 b) 9 c) 10 d) 7 6) Look at the pair of ten-frames. Select two equations that show how to subtract by making 10. a) 17 - 7 = 10 b) 10 - 2 = 8 c) 17 - 6 = 11 d) 17 - 2 = 15 e) 11 - 1 = 10 7) Rita has 14 shells. She hides 9 in the sand. How many shells are left? a) 4 b) 9 c) 10 d) 5 8) Taylor ate 19 peas. Corey ate 9 peas. How many more peas did Taylor eat than Corey? a) 18 – 9 = 9 b) 19 – 11 = 8 c) 19 – 9 = 10 d) 19 – 6 = 13

G2_Lesson 10&11_Count back to subtract​ & Make 10 to subtract

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