Math Boot Camp 0006-001
Japanese ed. / Amazon Kindle / 2-digit minus 1-digit subtraction without regrouping : range 10 to 40

[Stage 4]

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 ①: ( 11.1 sec. )

 ②: ( 8.8 sec. )

 ③: ( 4.9 sec. )

 ④: ( 6.0 sec. )

 ⑤: ( 6.7 sec. )

 ⑥: ( 6.9 sec. )

 ⑦: ( 5.8 sec. )

 ⑧: ( 5.1 sec. )

 ⑨: ( 4.9 sec. )

 ⑩: ( 5.4 sec. )

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Math Boot Camp 0006-001
Japanese ed. / Amazon Kindle / 2-digit minus 1-digit subtraction without regrouping : range 10 to 40

[Stage 2]

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 ①:    ( 6.7 sec. )

 ②:    ( 6.2 sec. )

 ③:    ( 8.4 sec. )

 ④: ( 9.3 sec. )

 ⑤: ( 10.1 sec. )

 ⑥: ( 10.9 sec. )

 ⑦: ( 8.8 sec. )

 ⑧: ( 7.9 sec. )

 ⑨: ( 9.0 sec. )

 ⑩: ( 6.4 sec. )

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Math Boot Camp 0006-001
Japanese ed. / Amazon Kindle / 2-digit minus 1-digit subtraction without regrouping : range 10 to 40

[Stage 2]

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 ①: ( 7.5 sec. )

 ②: ( 5.7 sec. )

 ③: ( 6.6 sec. )

 ④: ( 7.5 sec. )

 ⑤: ( 8.6 sec. )

 ⑥: ( 7.6 sec. )

 ⑦: ( 9.2 sec. )

 ⑧: ( 6.9 sec. )

 ⑨: ( 7.8 sec. )

 ⑩: ( 7.4 sec. )

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