Adding Tens: Strategies for 1st Graders

What tools are used to add tens to any two-digit number?

• Number line, abacus, and charts

• Place value blocks, number bonds, and hundreds charts

• Algebraic formulas and equations

• Calculators and digital apps

Tags

CCSS.2.NBT.B.6

What is the result of adding 40 to 12?

• 62

• 42

• 50

• 52

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How is the number 12 broken down to simplify addition?

• 6 and 6

• 8 and 4

• 5 and 7

• 10 and 2

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2

What is the sum of 24 and 50?

• 74

• 72

• 70

• 76

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How many tens are in the number 50?

• Seven

• Four

• Six

• Five

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

What components make up the number 24?

• Two tens and three ones

• Two tens and four ones

• Two tens and five ones

• Three tens and four ones

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

What is the result of adding 40 to 42?

• 86

• 84

• 80

• 82

Tags

CCSS.2.NBT.B.6

How is the number 42 broken down for addition?

• Thirty and twelve

• Fifty and minus eight

• Twenty and twenty-two

• Forty and two

Tags

CCSS.2.OA.A.1

What does four tens plus four tens equal?

• Seven tens

• Ten tens

• Nine tens

• Eight tens

Tags

CCSS.2.NBT.A.1B

What method is suggested to simplify adding tens?

• Using number bonds

• Memorizing the sums

• Using a calculator

• Guessing the results

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2