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Unit 6, Lesson 11

Add a multiple of 10 to any two-digit number within 100.

EngageNY 60 min(s)

In this lesson, students add a multiple of 10 to any two-digit number, such as 64 + 30. While some students may initially apply their ability to mentally add 10 by counting on by tens (64, 74, 84, 94), students also decompose 64 into 60 and 4 to solve, as shown to the right.

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Other lessons from Unit 6 in Grade 1 by EngageNY

Previous Lesson

Unit 6, Lesson 10

Add and subtract multiples of 10 from multiples of 10 to 100, including dimes.

60 min(s)

Next Lesson

Unit 6, Lesson 12

Add a pair of two-digit numbers when the ones digits have a sum less than or equal to 10.

60 min(s)

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1 Content Standard is aligned with this lesson

1.NBT.C.4

Major StandardsSupporting StandardsAdditional Standards

Standard 1.NBT.C.4

Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

Part of Major Cluster 1.NBT.C

1 Math Practice Standard is aligned with this lesson

Standard MP.3

Construct viable arguments and critique the reasoning of others.

Prerequisites for 1.NBT.C.4

1st Grade

1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

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.4

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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