Multiplying decimals by whole numbers
Multiply one-digit numbers with up to two decimal places by whole numbers (e.g. 3.47 × 6)
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Multiplying decimals by whole numbers means practising the idea at the table with counters or paper models and one clear check. We will demo once, then your child tries.
Materials: Place-value grid (ones / tenths); Pencil. Adult shows 0.3 as three tenths on the grid. Child builds three decimal amounts on the grid and reads them aloud. Done: three correct decimal readings. Stop after the fresh check; keep optional challenge for another day.
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Start practiceMultiplying decimals by whole numbers practice
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Learning resources
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Illustrative Mathematics · Practice link — not the full lesson
To Multiply or not to multiply?
Before you open · source notes
To Multiply or not to multiply? supports deciding when multiplication applies, including decimal contexts with wholes. Not every addition story.
Free, no sign-in. A teacher solution is on the same page, so use the student view with your child.
Before you openAsk the learner whether to multiply and find the product with a whole-number factor.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public Illustrative Mathematics task page. The .html address responds HTTP 308 to this URL. An anonymous GET of this URL on 2026-11-12 returned HTTP 200 with no login or payment prompt. Where a teacher solution is present, it is on the same page as the student task; this check did not find a separate locked student view. An adult can use the student view section and should not read a solution aloud. Advertising was not observed in the fetched HTML text; that is not a browser, device, or ad-free guarantee. This is a paper or discussion task, not an automatically marked interactive game. Opening the link does not save practice or assess mastery. Diagrams on the page use missing or filename-only alt text, so they are not an accessible image equivalent. Accessibility still depends on an adult describing the picture.
Illustrative Mathematics. “To Multiply or not to multiply?.” Licensed CC BY-NC-SA 4.0. External task; Gakuva does not copy, host, embed, or redistribute it.
CC BY-NC-SA 4.0 — link only
Check understanding
- Correctly compute 4.56 × 7 using a written method
- Use place-value reasoning to explain why 3.2 × 5 = 16.0
- Model a decimal multiplication using an area diagram or expanded form
“Can your child work out '3.47 × 6' — keeping the decimal point in the right place and carrying correctly through each column?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Multiplication & Division
- Age range
- Ages 10–13
Standards