Practice addition and subtraction with unique questions about whole numbers, decimals, negative numbers, missing values, word problems, and multi-step arithmetic. Use hints when needed, choose an answer, and review the explanation after each question.
You answered 0 out of 10 questions correctly.
The 10 questions cover whole numbers, decimals, negative numbers, missing values, and a multi-step context problem. Strong performance means not only getting the arithmetic right, but choosing a method that keeps place value, signs, and intermediate results under control.
Keep hundreds, tens, ones, tenths, and hundredths aligned so each operation combines like units.
Break apart, compensate, or use a nearby friendly number instead of relying on one rigid written method.
Interpret addition and subtraction as movement and difference on the number line, not as sign rules without meaning.
Use subtraction to check addition and addition to check subtraction, especially when a missing value is involved.
A useful strategy is to move a small amount from one addend to the other so that one number becomes easier to work with.
398 + 267 → add 2 to 398 and subtract 2 from 267 → 400 + 265 = 665.
476 + 289 → 476 + 200 + 80 + 9 → 676 + 80 + 9 = 765.
1,000 − 438 can be viewed as the distance from 438 to 1,000: +2, +60, +500 = 562.
For −12 + 19, start at −12 and move 19 units to the right. Crossing zero is not a special exception — it is just part of the movement.
Decimal addition and subtraction are reliable when the decimal points line up. Writing missing zeros makes the place-value structure visible.
Rewrite 4.6 as 4.60 before combining hundredths.
Rewrite 9.3 as 9.30 before subtracting 4.85.
The quiz includes 64 + ___ = 150. Instead of guessing, treat the blank as an unknown quantity and undo the addition.
A warehouse begins the day with 1,280 units, receives 465 more, ships 718 units, and then receives a returned shipment of 96 units. The arithmetic is simple; organization is the real skill.
Decimal points must line up so tenths are combined with tenths and hundredths with hundredths.
When subtracting a larger positive number from a smaller one, the result is negative.
In multi-step problems, combining all numbers at once makes it easier to reverse an operation or miss a change.
Review place value, basic addition/subtraction facts, regrouping, and number-line meaning for negative values.
Focus on the exact representation that caused errors: whole numbers, decimals, negatives, or missing values.
Move toward multi-step arithmetic, percentages, ratios, signed expressions, and applied word problems.