318 + 19 = 300 +10 +8 +10 + 9 = 300 + 10 + 10 + 8 + 9 = 320 + 8 + 9 (此时手指脚趾已经够数,如果是我侄子,40以内基本够数,他可以循环数,两次循环基本不出错) = 320 + 19 =320 +10 + 9 = 330 +9 = 339哦耶。question: 300 + 26 =?
a Grade 4 student here, by the way, she declared that she's one of the smartest students in the class. she did last night as the following steps:
300 +26 = 300 + 20 +6 =320 + 6= 326
As her parent, should I correct it? That's so redundant.
318 + 19 = 300 +10 +8 +10 + 9 = 300 + 10 + 10 + 8 + 9 = 320 + 8 + 9 (此时手指脚趾已经够数,如果是我侄子,40以内基本够数,他可以循环数,两次循环基本不出错) = 320 + 19 =320 +10 + 9 = 330 +9 = 339哦耶。