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Unit: Get ready for addition, subtraction, and estimation

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Possible mastery points

Rounding to the nearest 10 or 100

Learn
Rounding to the nearest 10 on the number line
(Opens a modal)
Rounding to the nearest 100 on the number line
(Opens a modal)
Rounding to nearest 10 and 100
(Opens a modal)
Practice
Round to nearest 10 or 100 on the number lineGet 5 of 7 questions to level up!
Round to nearest 10 or 100Get 3 of 4 questions to level up!

Strategies for adding two and three-digit numbers

Learn
Breaking apart 3-digit addition problems
(Opens a modal)
Addition using groups of 10 and 100
(Opens a modal)
Practice
Break apart 3-digit addition problemsGet 3 of 4 questions to level up!
Add using groups of 10 and 100Get 3 of 4 questions to level up!
Select strategies for adding within 1000Get 3 of 4 questions to level up!

Strategies for subtracting two and three-digit numbers

Learn
Subtraction by breaking apart
(Opens a modal)
Methods for subtracting 3-digit numbers
(Opens a modal)
Practice
Break apart 3-digit subtraction problemsGet 3 of 4 questions to level up!
Select strategies for subtracting within 1000Get 3 of 4 questions to level up!

Adding and subtracting within 1,000

Learn
Using place value to add 3-digit numbers: part 1
(Opens a modal)
Using place value to add 3-digit numbers: part 2
(Opens a modal)
Adding 3-digit numbers
(Opens a modal)
Worked example: Subtracting 3-digit numbers (regrouping)
(Opens a modal)
Subtracting 3-digit numbers (regrouping)
(Opens a modal)
Worked example: Subtracting 3-digit numbers (regrouping from 0)
(Opens a modal)
Practice
Add within 1000Get 3 of 4 questions to level up!
Subtract within 1000Get 3 of 4 questions to level up!
Up next for you:

Unit test

Level up on all the skills in this unit and collect up to 900 Mastery points!