Once, you break your ten into ones then instead of drawing the lines and crossing them you can use your fingers. Example If we have to subtract 18 cars from 20 cars. Then in one’s column, 0 – 8 does not make any sense, so we must regroup one of the two tens such the 0 now...
a文中简要分析了中国现代功利主义价值观形成的原因,指出了功利主义价值观对当代中国科学研究和教育发展的不利影响 In the article has briefly analyzed the reason which the Chinese modern utilitarianism values form, has pointed out the utilitarianism values to the Contemporary China scientific research and the...
10=9+1 10−1=9 1+9=10 10−9=1 7+?=1010−?=7 6=5+1 6−1=5 1+5=6 6−5=1 7=5+2 7−2=5 2+5=7 7−5=2 7=4+3 7−3=4 3+4=7 7−4=3 7+3=10 15+5=20 20=11+99+11=20 20−9=1120−11=9 ...