Pre Math Boot Camp 0001-001
English ed. / Amazon Kindle / 1-digit plus 1-digit addition without regrouping

[Stage 9]

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 ①: ( 6.4 sec. )

 ②: ( 4.7 sec. )

 ③: ( 5.5 sec. )

 ④: ( 4.5 sec. )

 ⑤: ( 4.7 sec. )

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Pre Math Boot Camp 0002-001
English ed. / Amazon Kindle / 1-digit minus 1-digit subtraction without regrouping

[Stage 3]

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 ①: ( 4.3 sec. )

 ②: ( 5.6 sec. )

 ③: ( 3.6 sec. )

 ④: ( 6.4 sec. )

 ⑤: ( 5.9 sec. )

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Pre Math Boot Camp 0010-001
Japanese ed. / Amazon Kindle / 1-digit plus 1-digit addition without regrouping + 1-digit minus 1-digit subtraction without regrouping

[Stage 7]

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 ①: ( 6.6 sec. )

 ②: ( 5.6 sec. )

 ③: ( 6.6 sec. )

 ④: ( 5.3 sec. )

 ⑤: ( 5.6 sec. )

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Pre Math Boot Camp 0003-001
English ed. / Amazon Kindle / 1-digit plus 1-digit addition with regrouping

[Stage 7]

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 ①:    ( 5.2 sec. )

 ②:    ( 7.1 sec. )

 ③: ( 7.8 sec. )

 ④: ( 7.6 sec. )

 ⑤: ( 8.6 sec. )

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Pre Math Boot Camp 0003-001
English ed. / Amazon Kindle / 1-digit plus 1-digit addition with regrouping

[Stage 7]

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 ①: ( 6.6 sec. )

 ②: ( 4.6 sec. )

 ③: ( 8.3 sec. )

 ④: ( 6.7 sec. )

 ⑤: ( 6.4 sec. )

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Pre Math Boot Camp 0001-001
Japanese ed. / Amazon Kindle / 1-digit plus 1-digit addition without regrouping

[Stage 7]

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 ①: ( 4.9 sec. )

 ②: ( 4.8 sec. )

 ③: ( 6.6 sec. )

 ④: ( 5.9 sec. )

 ⑤: ( 7.0 sec. )

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Math Boot Camp 0011-001
English ed. / Amazon Kindle / 1-digit by 1-digit multiplication

[Stage 2]

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 ①: ( 7.8 sec. )

 ②: ( 8.3 sec. )

 ③: ( 7.0 sec. )

 ④: ( 8.6 sec. )

 ⑤: ( 9.2 sec. )

 ⑥: ( 8.3 sec. )

 ⑦: ( 7.9 sec. )

 ⑧: ( 8.6 sec. )

 ⑨: ( 7.8 sec. )

 ⑩: ( 8.0 sec. )

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