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Seashell Collectors: Adding Tens and Ones worksheet preview

Worksheet

Seashell Collectors: Adding Tens and Ones

Grade 1 addition within 100 with beach seashells: add tens to tens and ones to ones, count on by tens, and make a new ten.

Grade 1MathInteractive · Printable

Aligned to1.NBT.C.4

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What’s included

  • Single worksheet
  • Auto-graded online
  • 1 Common Core standard
  • Printable answer key
  • 12 questions
  • Classroom-ready

Details

Format
Interactive · Printable
Grade
Grade 1
Subject
Math
Question types
Fill in the blank, Multiple choice, Matching, Circle the answer, Sorting, Short answer

About this worksheet

What students practice

  • Students add a two-digit number and a one-digit number within 100, making a new ten when needed.
  • Students add a two-digit number and a multiple of 10 by counting on by tens.
  • Students add two-digit numbers by adding tens with tens and ones with ones.

How to use

Use after students can show two-digit numbers with base ten blocks. Let them build each shell bucket with rods and cubes in the first section, then do the check on their own.

Curriculum

Common Core standard covered

1.NBT.C.4

Add within 100 using models and place-value strategies, including adding tens and ones.

Preview

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Name Date

Seashell Collectors: Adding Tens and Ones

Add within 100 by putting tens with tens and ones with ones.

Shell Buckets

Each rod is 10 shells. Each cube is 1 shell. Add tens with tens and ones with ones.

1.
Noah has these shells in his bucket. Then he finds 4 more shells.

23 + 4 =   shells

2.
Lena has these shells. Her dad gives her 2 more bags with 10 shells in each bag.

35 + 20 =   shells

3.
Add 43 + 25 by place.

4 tens + 2 tens =   tens
3 ones + 5 ones =   ones
43 + 25 =  

4.
Kai has these shells. He finds 5 more shells.

8 ones + 5 ones =   ones
13 ones is 1 ten and   ones.
28 + 5 =   shells

5.
Count on by tens to add 46 + 30.

46,  ,  ,  
46 + 30 =  

6.
Maria finds 52 white shells and 7 pink shells.

Maria finds   shells in all.

7.
Sam finds 6 shells. His sister finds 81 shells. How many shells do they find in all?

6 + 81 =   shells

Tide Pool Check

Choose, match, circle, sort, and explain.

8.
Ava has 34 shells. Her brother gives her 25 more. How many shells does Ava have now?
  • A. 49
  • B. 95
  • C. 59
  • D. 69
9.
Match each problem to its sum.
  1. 61 + 8
  2. 50 + 40
  3. 27 + 30
  4. 38 + 6
  1. A. 57
  2. B. 44
  3. C. 69
  4. D. 90
10.
Circle every problem that makes 80.

70 + 108 + 1074 + 673 + 662 + 2040 + 40

11.
Add the ones in each problem. Do they make a new ten?
26 + 753 + 439 + 245 + 3064 + 612 + 5
New ten (ones add to 10 or more)No new ten (ones add to less than 10)
12.
Jamal says 47 + 20 = 49. Is he right? Explain how you know.

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