Traveling from Nasty Problems to Nice Ones

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Presentation transcript:

Traveling from Nasty Problems to Nice Ones SUBTRACTION REVIEW Using Compliments Traveling from Nasty Problems to Nice Ones Math Grade 6 by Beckey Townsend

VIDEO LESSONS Remember “subtract the ones” strategy from previous grades https://www.youtube.com/watch?v=o7lmBDjImYI ((3:12) Remember “Left to Right” subtraction https://www.youtube.com/watch?v=iw3myYJOjbw (3:37 min) Remember “Model Drawing” for a subtraction word problem https://www.youtube.com/watch?v=0NcWP1uP1r4 (5:44 min) Remember Standard Algorithm https://www.youtube.com/watch?v=Y6M89-6106I (6:56 min) Shows base ten block pictures https://www.youtube.com/watch?v=BkzoUfyAXDU (9:08 min) Mental Math Trick “Counting Down” + “Round Up” https://www.youtube.com/watch?v=6s4xS-JfX5w (6:57 min) https://www.youtube.com/watch?v=wCw9iuQICy4 (8:17 min) https://www.youtube.com/watch?v=wCw9iuQICy4&t=191s (8:17 min)

Try it using the other compliment: Convert 73 to 80 Using Compliments to Change Nasty Subtraction Problems into Nice Ones COMPARE TO: Standard Algorithm 6 13 73 -46 27 73 -46 +4 = 77 +4 = 50 77 -50 27 Try it using the other compliment: Convert 73 to 80

PRACTICE: Change these nasty subtraction numbers into nice ones by using compliments 58 94 45 63 -19 -27 -36 -45 Explain HOW to use this compliment method for subtraction and WHY it works. WHY?

EXIT TICKET TODAY WE LEARNED … … to use compliments to “make tens” before subtracting. … tell HOW to use compliment method and explain WHY it works. … to practice fluency for subtraction. Grab your student assignment sheet, and your math journal slip. Complete the “exit ticket” assignment and turn it in to the teacher. Continue working on the rest of the assignment sheet. If it is not finished in class, then it must be completed for homework.