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4 The closest
number
Unit Objective Make the closest number to the target number using
given numbers and operations.
.Based on a concept of subtraction with regrouping and
difference between two numbers, make two numbers using
number chips to add or subtract them and find the closest
number to a target number.
.Recognize the number sentences (3-digit)±(1-digit) and
(2-digit)±(2-digit) can be made using four numbers and one
operation and also find the sum or difference in varioius ways.
NCTM Standards
GeomeNumber and Operations
.Develop and use strategies for whole-number
computations, with a focus on addition and subtraction.
.Use a variety of methods and tools to compute,
including objects, mental computation, estimation,
paper and pencil, and calculators.
40 Workbook B-7
number
Unit Objective Make the closest number to the target number using
given numbers and operations.
.Based on a concept of subtraction with regrouping and
difference between two numbers, make two numbers using
number chips to add or subtract them and find the closest
number to a target number.
.Recognize the number sentences (3-digit)±(1-digit) and
(2-digit)±(2-digit) can be made using four numbers and one
operation and also find the sum or difference in varioius ways.
NCTM Standards
GeomeNumber and Operations
.Develop and use strategies for whole-number
computations, with a focus on addition and subtraction.
.Use a variety of methods and tools to compute,
including objects, mental computation, estimation,
paper and pencil, and calculators.
40 Workbook B-7
