Printable Adding Whole Tens and Hundreds Worksheets

Adding whole tens and hundreds worksheets teach students to combine round numbers using basic fact patterns. These printable sheets develop mental math speed with place value models and answer keys.

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Structured, printable skill sheets with step-by-step guidance for Adding Whole Tens and Hundreds.

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About Adding Whole Tens and Hundreds

What this skill is

Adding whole tens and hundreds applies single-digit addition facts to higher place values (such as knowing 3 + 4 = 7 helps solve 30 + 40 = 70 and 300 + 400 = 700).

When children learn it

Adding multiples of 10 within 100 begins in 1st grade (CCSS 1.NBT.C.4). Adding multiples of 100 within 1,000 is taught in 2nd and 3rd grade (CCSS 2.NBT.B.8).

Teaching Tips

  • Talk in unit language: say "3 tens plus 4 tens equals 7 tens". Then ask: "What number is 7 tens? 70!". Framing the problem in units makes the math feel identical to simple single-digit addition.

Common Mistakes

  • Appending the wrong number of zeros, writing 30 + 40 = 700.
  • Adding the tens digit to the ones digit by mistake when numbers are not aligned vertically.
  • Losing track of place values when sums cross into hundreds (like 60 + 50 = 110).

More Addition Concepts

Addition SentencesAddition Within 10Addition with Number LinesNumber BondsAddition Facts to 20Doubles and Near DoublesFact FamiliesMaking the Next TenTwo-Digit AdditionAddition Word ProblemsAdding Three or More NumbersMissing AddendMental AdditionThree-Digit Addition4-Digit AdditionAdding Large Numbers
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