Interactive Math Lessons for Subtraction Within 20
Engage in interactive math lessons focusing on subtraction within 20 by using the strategy of making 10 and not crossing 10. Practice fluency with subtraction problems and identify number lines accurately. Complete tables and calculations to reinforce understanding. Enhance subtraction skills with fun activities and visual aids.
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Presentation Transcript
Addition & Subtraction Add by making 10 Subtraction Not crossing 10 Block 1 Week 2
Lesson 4 Step: Subtraction (not crossing 10)
Fluency Beth has 18 marbles. She gives 6 away. How many are left? 18 6 12 18 - = 6 12
Fluency Ben has 15 pens. He gives 3 away. How many are left? 15 3 12 15 - = 3 12
Fluency Kat has 19 beads. She gives 8 away. How many are left? 19 8 11 19 - = 8 11
Fluency Mo has 18 marbles. He gives 3 away. How many are left? 18 3 15 18 - = 3 15
Fluency Sue has 20 cakes. She gives 7 away. How many are left? 20 7 13 20 - = 7 13
Fluency Ben has 19 sweets. He gives 5 away. How many are left? 19 5 14 19 - = 5 14
Which number line represents the number frames? - 6 A) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 - 8 - B) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 - 6 C) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Explain how you know. C is correct as it shows 18 6 = 12
Complete the table and calculation. _______ - _______ = _______ 17 5 12
