Number Splitters Worksheet
Name:
Date:
Teacher-Supported Practice • Numbers 11–15
Number Splitters: Teens in Tens & Ones
Every teen number has one full group of 10 and some extra ones. Look at the ten-frames to split each number!
Scaffold: 10 + Ones
Model Example
13 is 10 and 3
1 full 10-frame plus 3 more counters makes 13.
1 Full Ten (10)
3 Extra Ones (3)
Number Bond
13
10
3
13 = 10 + 3
1 Split 14
Draw counters to complete 14, then fill in the missing parts.
10
Draw Extra Ones
Number Bond
14
10
Equation
14 = 10 +
2 Split 12
Draw counters to complete 12, then fill in the missing parts.
10
Draw Extra Ones
Number Bond
12
10
Equation
12 = 10 +
3 Split 15
Draw counters to complete 15, then fill in the missing parts.
10
Draw Extra Ones
Number Bond
15
10
Equation
15 = 10 +
Page 1 • Decomposing Teens (11–15) Say aloud: "10 and ___ make ___"
Student: ______________________ Page 2 • Decomposing Numbers 16–20 Date: ____________
Larger Teens & Twenty
Count the full ten-frame, then count the ones. Fill in the missing numbers in the bond and equation.
Count: 10, then count on!
4 Decompose 16
10 dark counters + 6 open counters
16
10
16 = 10 +
16 is 10 and ___
5 Decompose 17
10 dark counters + 7 open counters
17
10
17 = 10 +
17 is 10 and ___
6 Decompose 19
10 dark counters + 9 open counters
19
10
19 = 10 +
19 is 10 and ___
7 Special Challenge: Decompose 20!
Two whole ten-frames!
20
10
20 = 10 +
20 is 10 and ___
Teacher Notes: Used physical counters Counted on from 10 Fluent with 10 + n
Total Score: _____ / 7
Number Splitters Answer Key
Teacher Guide & Key Number Splitters Answer Key
Numbers 11–15 (Page 1)
Instructional Dialogue: Prompt students to read the full ten-frame as a complete unit: "We don't need to count 1 to 10 each time—we know a full ten-frame is 10! Then we count on: 11, 12, 13, 14."
1 Split 14: Answer & Model
Part: 4 ones
Ten (10)
4 Counters Drawn
14
10
4
14 = 10 + 4
2 Split 12: Answer & Model
Part: 2 ones
Ten (10)
2 Counters Drawn
12
10
2
12 = 10 + 2
3 Split 15: Answer & Model
Part: 5 ones
Ten (10)
5 Counters Drawn (1 row)
15
10
5
15 = 10 + 5
Common Misconception Alert: Students may write 14 = 10 + 14 or write the total in both blanks. Remind them: "We already took out the ten! What is leftover in the other ten-frame?" Have them point to and physically count only the extra ones.
Teacher Guide & Key Numbers 16–20 Solutions
Numbers 16–20 (Page 2)
Problem 4: 16 Answer: 6
Number Bond: 16 splits into 10 and 6
Equation: 16 = 10 + 6
Counters: 1 full 10-frame + 5 on top row + 1 on bottom row.
Problem 5: 17 Answer: 7
Number Bond: 17 splits into 10 and 7
Equation: 17 = 10 + 7
Counters: 1 full 10-frame + 5 on top row + 2 on bottom row.
Problem 6: 19 Answer: 9
Number Bond: 19 splits into 10 and 9
Equation: 19 = 10 + 9
Counters: 1 full 10-frame + 9 counters (only 1 blank spot left).
Problem 7: 20 (Challenge) Answer: 10
Number Bond: 20 splits into 10 and 10
Equation: 20 = 10 + 10
2 full ten-frames: 2 tens make 20!
Tiered Teacher Support Strategies
1. Concrete Support
Provide two physical egg cartons or foam 10-frames with two-color counters (red for the 10, yellow for ones). Physically move the ones aside.
For tactile learners
2. Verbal Scaffolding
Use the "Hide Zero" cards technique: Place the single-digit card over the zero of a "10" card, then pull it apart to show the hidden 10.
For verbal/visual connection
3. Extension Prompt
