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Knowledge atom

Add within 20 crossing the ten

G1.FLU.11Grade 1FluencySource mission: Make Ten & Cross Ten

Computes sums between 10 and 20 where the ones digits total more than ten, using a secure strategy.

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Evidence progress0 of 2 pieces collected
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Standards alignment

1.OA.C.6

Prerequisites

Common misconceptions

  • off-by-one from counting on (answers 14 or 16 for 8 + 7)
  • reports only the leftover ones after making the ten (answers 5 for 8 + 7)

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i
EvidencePerformanceStatusNext step
Show the stepsCarry out the procedure accurately Not startedCollect one observation
Recall itRetrieve the idea without a cue Not startedCollect one observation

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Computes sums between 10 and 20 where the ones digits total more than ten, using a secure strategy.

Estimated time: ~5 min

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