Author Question: All of the following could be examples of invented strategies for obtaining the sum of two-digit ... (Read 77 times)

SAVANNAHHOOPER23 · **on:** Feb 18, 2021

All of the following could be examples of invented strategies for obtaining the sum of two-digit numbers EXCEPT:
◦ Adding on tens and then ones (For example, to solve 24 + 35, think 24 + 30 = 54 and 5 more makes 59.)
◦ Using nicer numbers to estimate (For example, to solve 24 + 47, think 24 is close to 25 and 47 is closer to 45 so 24 + 47 = 25 + 45 = 70.)
◦ Moving some to make 10 (For example, to solve 24 + 35, move 6 from 35 to make 24 + 6 and then add 30 to the remaining 29.)
◦ Adding tens and adding ones then combining (For example, to solve 24 + 35, think 20 + 30 = 50 and 4 + 5 = 9 so 50 + 9 = 59.)

gasdhashg · **Reply #1 on:** Feb 18, 2021

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