Pre Math Boot Camp0035-001 English ed. / Amazon Kindle / 1-digit plus 1-digit negative addition + 1-digit minus 1-digit subtraction range -1 to -9 + 1-digit by 1-digit negative multiplication
[Stage 7]
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①: ( 6.9 sec. )
②: ( 9.4 sec. )
③: ( 8.5 sec. )
④: ( 8.3 sec. )
⑤: ( 9.2 sec. )
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Total: 42.3 sec.
2020/02/07 18:37:30
[1] tomtommy 4 / 5 51.3 sec.
Pre Math Boot Camp0035-001 Japanese ed. / Amazon Kindle / 1-digit plus 1-digit negative addition + 1-digit minus 1-digit subtraction range -1 to -9 + 1-digit by 1-digit negative multiplication