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We don't have to rely on the standard algorithm when subtracting. Here are other ways to subtract.

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Howie Hua

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20,344 görüntüleme • 2 yıl önce •via X (Twitter)

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@rye723 @HurdleLatoya @luvmesumath @WandaCalhoun13

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the way i mentally do it is first do 80-30=50, then add 3 more.

Digital Maker CIC profil fotoğrafı
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added 1 to each number (76-40) = 36

Smilyspook profil fotoğrafı
Smilyspook2 yıl önce

Love the last one. 7 [effectively 70] minus 3 [effectively 30] = 40 then 5 minus 9 = -4 then 40-4 = 36.

Ms KH profil fotoğrafı
Ms KH2 yıl önce

2nd graders not relying on standard algorithm…. They are huge fans. #mathmotivation

Howie Hua profil fotoğrafı
Howie Hua2 yıl önce

Awesome! Have they practiced negative number results for subtraction before this?

Sir Rodhi Rejab profil fotoğrafı
Sir Rodhi Rejab2 yıl önce

I like the last one, subtracting from left to right. But is it applicable to 3 digits or above?

Snapquester Mage profil fotoğrafı
Snapquester Mage2 yıl önce

I think as: 80 is 50 away from 30. Then another 2 away for 28 (52 total so far) and another 1 away for 81 (53 total).

Cotsdi profil fotoğrafı
Cotsdi2 yıl önce

Pocket change use to be counted upwards when the sales clerk was giving change.

Chad profil fotoğrafı
Chad2 yıl önce

That last approach is interesting. Thanks.

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