Estimating Answers to Difficult Decimal Questions
In this worksheet, students use rounding to come up with an estimate of a reasonable answer to some addition questions that would be difficult for them to do in their heads. Once they have an estimate for each question, they will use a calculator to check how close their estimates were.
This worksheet is part of a larger unit that was written to help your Year 6 students add and subtract decimals and develop estimates through rounding to check their answers.
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Learning goals
- We are learning to apply knowledge of place value to add and subtract decimals and to use estimation and rounding to check the reasonableness of our answers.
- We are learning to estimate and approximate solutions to problems involving rational numbers and percentages.
- We are learning to add and subtract decimals and use estimation and rounding to check answers.
Curriculum alignment
AC9M6N08
9
Approximate numerical solutions to problems involving rational numbers and percentages, including financial contexts, using appropriate estimation strategies
AC9M6N04
9
Apply knowledge of place value to add and subtract decimals, using digital tools where appropriate; use estimation and rounding to check the reasonableness of answers
ACMNA128
8.4
Add and subtract decimals, with and without digital technologies, and use estimation and rounding to check the reasonableness of answers
MA3-1WM
old
Describes and represents mathematical situations in a variety of ways using mathematical terminology and some conventions
MA3-2WM
old
Selects and applies appropriate problem- solving strategies, including the use of digital technologies, in undertaking investigations
MA3-3WM
old
Gives a valid reason for supporting one possible solution over another
MA3-7NA
old
Compares, orders and calculates with fractions, decimals and percentages
MA3-RQF-02
new
Determines 1/2, 1/4, 1/5 and 1/10 of measures and quantities
MA3-RQF-01
new
Compares and orders fractions with denominators of 2, 3, 4, 5, 6, 8 and 10
MA3-RN-01
new
Applies an understanding of place value and the role of zero to represent the properties of numbers
MA3-RN-02
new
Compares and orders decimals up to 3 decimal places
MA3-RN-03
new
Determines percentages of quantities, and finds equivalent fractions and decimals for benchmark percentage values
MA3-AR-01
new
Selects and applies appropriate strategies to solve addition and subtraction problems
MA3-MR-01
new
Selects and applies appropriate strategies to solve multiplication and division problems
MA3-MR-02
new
Constructs and completes number sentences involving multiplicative relations, applying the order of operations to calculations
Australian Curriculum covers QLD / SA / WA / NT / TAS / ACT.