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Lesson 2 · Workbook p. 17

Decimals: Add, Subtract, Multiply

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Apples cost $3.76 and peaches cost $4.75. What do they cost in all?

In this video

  • Line up the decimal points so dollars add to dollars and cents add to cents.
  • Subtract 5.2 − 1.375 by writing in zeros and trading 1 for 10 to borrow.
  • Multiply 0.3 × 0.4 on a hundred grid: the overlap is 12 hundredths.

Try it together

0.6 × 0.7
Show the answer
0.42
6 × 7 = 42, and the answer needs 2 decimal places. Picture 6 columns and 7 rows on a hundred grid.

Ask, don't tell

“What place is that digit in?”

“Is your answer bigger or smaller than you expected?”

The workbook these videos go with

Math for Parents – 6th Grade: Numbers & Operations. Picture-first lessons, “Ask, don't tell” prompts on every page, worked examples, real-world missions, and answer keys with coaching notes, so you can help even if it's been years since you learned it.

Get the workbook on Amazon