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1st grade math · Unit 5: Adding and subtracting with tens

Count back to the ten

What this lesson shows

33 − 6 on a number line: back 3 to 30, then 3 more. 27.

The worked example

The lesson works this one step by step: 33 − 6 = □. Then your kid tries one like it on paper.

The steps

  1. Start on the line
  2. Jump back to the ten
  3. Jump back the rest

Helping at home

On a number line, jump back to the ten below. Split the number you take: the part that reaches the ten, then the rest.

If your kid gets stuck

How far back to the ten?

Watch it with Lux

With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.

See how Lux works

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