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Unit 4, Lesson 5

Identify 10 more, 10 less, 1 more, and 1 less than a two-digit number.

EngageNY 60 min(s)

In this lesson, students use Rekenrek bracelets, linking cubes, and drawings to find 10 more, 10 less, 1 more, and 1 less than a given number. Then they begin to explain the patterns that they see. For example, "I see that 10 less than 34 is just 1 less ten, so it must be 24." Students represent how the number changed using arrow notation.

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Other lessons from Unit 4 in Grade 1 by EngageNY

Previous Lesson

Unit 4, Lesson 4

Write and interpret two-digit numbers as addition sentences that combine tens and ones.

60 min(s)

Next Lesson

Unit 4, Lesson 6

Use dimes and pennies as representations of tens and ones.

60 min(s)

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Unit 1, Lesson 9

Arrow Cards

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North Carolina Department of Public Instruction

Unit 1, Lesson 10

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1 Content Standard is aligned with this lesson

1.NBT.C.5

Major StandardsSupporting StandardsAdditional Standards

Standard 1.NBT.C.5

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

Part of Major Cluster 1.NBT.C

1 Math Practice Standard is aligned with this lesson

Standard MP.6

Attend to precision.

Prerequisites for 1.NBT.C.5

1st Grade

1.NBT.B.2

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

1.NBT.B.2.A

10 can be thought of as a bundle of ten ones - called a "ten."

1.NBT.B.2.B

The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

1.NBT.B.2.C

The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).

Upcoming Standards for 1.NBT.C.5

2nd Grade

2.OA.A.1

Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

2.NBT.B.5

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

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