L.I - I have learnt to use Place Value to solve both Addition & Subtraction Problems.
1.
There are 21 people at a beach, and 13 more people arrive.
Show how to work out how many people are at the beach altogether
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21 + 13 = ___
20 + 10 = 30
1 + 3 = 4
30 + 4 = 34 ☺
Answer - 34 YES! What strategy did you use?
Respond - I used place value to solve all 3 addition problems.
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2
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Two classes go on camp together. One class has 47 students and the other has 38.
Show how to work out how many students go on camp
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47 + 38 = ____
40 + 30 = 70
7 + the 3 from the 8 = 10
10 + the remaining 5 from the 8 = 15
70 + 15 = 85 ☺
Answer - 85 - Great to see you set out work neatly.
Next Step: Try and use another strategy.
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3. A farmer has 63 cows. He buys 39 more cows.
Show how to work out how many cows he has altogether.
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63 + 39 = ______
60 + 30 = 90
9 + the 1 from 3 = 10
10 + the remaining 2 from the 3 = 12
90 + 12 = 102
Answer - 102 - ☺
Great use of Place Value as a strategy.
Next Step: To use another strategy such as Tidy Number or Near Ten. Post your work and label PORTFOLIO 2013
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