Math Drills
Addition and Subtraction
C-1Word Problems
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What this worksheet covers
- Topic
- Rounding Numbers
- Worksheet
- Addition and Subtraction
Three tiers are written one after another: the original expression, the rounded expression, and its answer. From Addition (1 Significant Digit) to Addition (To the Ten Thousands Place) a sum is estimated with the rounding place shifting, and from Subtraction (To the Hundreds Place) onward the same is done with a difference. Besides single-line working, Addition (Word Problems) and Subtraction (Word Problems) read scenes of population and weight.
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An estimate rounds before it adds. Work the true answer out first and round afterwards and the result looks close enough to pass unnoticed. The clue is the middle tier, where every figure should carry nothing but zeros below the place named. Original figures left standing there mean the rounding was put off until later.
The hand that rounded a single number in Rounding now turns on each figure inside an expression. In Multiplication and Division the rounding place narrows to one significant digit alone and the signs change to multiplying and dividing.
- Addition (Word Problems)2 questions
- Subtraction (Word Problems)2 questions
Questions & answers
Problems and answers on this worksheet
These are the problems in “Rounding Numbers”, shown with their answers.
(1)In the gym at Riley's school, 3216 boys and 4859 girls have gathered. About how many are there in all? Round each number to the hundreds place, then add the rounded numbers to find the answer. Answer □
Answer: 8100people
(2)Ethan checked the books at the library. There are 1248 in the east area and 3617 in the west area. About how many are there in all? Round each number to the hundreds place, then add the rounded numbers to find the answer. Answer □
Answer: 4800books
(3)The library has 4532 books. So far, 2187 have been lent out. About how many are left? Round to the hundreds place to find the rounded number. Answer □
Answer: 2300books
(4)At a certain car factory, last month's production was 87654 cars and this month's was 56789. About how many more did they make last month than this month? Round to the ten-thousands place to find the rounded number. Answer □
Answer: 30000cars
What to do next
More worksheets in this unit
RoundingRounding Calculation (Thousands or Top 2 Digits)
Addition and SubtractionAddition and Subtraction Calculation (Thousands or Ten-Thousands)
Addition and SubtractionAddition and Subtraction Calculation (Hundreds or Top 1 Digit)
Multiplication and DivisionMultiplication and Division Calculation (Multiplication)
Multiplication and DivisionMultiplication and Division Calculation (Division)
Multiplication and DivisionMultiplication and Division Word Problems
Rounding Numbers ReviewRounding Numbers Review Calculation (Rounding)
Rounding Numbers ReviewRounding Numbers Review Calculation (Addition and Subtraction)
Rounding Numbers ReviewRounding Numbers Review Calculation (×, ÷, and More)
Rounding Numbers ReviewRounding Numbers Review Word Problems
