Find the missing whole or part in each number bond within 20.
MathApex√
Number Bonds within 20
Find the missing whole or part and write the number in the empty node.
Name: Date:
Write the missing number in the empty node.
Question 1:1.75
Question 2:2.63
Question 3:3.35
Question 4:4.76
Question 5:5.51
Question 6:6.24
Question 7:7.1211
Question 8:8.141
Question 9:9.56
Question 10:10.1110
Question 11:11.143
Question 12:12.312
Question 13:13.97
Question 14:14.104
Question 15:15.316
Question 16:16.1715
Question 17:17.191
Question 18:18.78
Question 19:19.2011
Question 20:20.187
MathApex
Answer key
Compare each complete Number Bond and missing value with your worksheet.
1.7 = 2 + 5→ part: 2
2.6 = 3 + 3→ part: 3
3.8 = 3 + 5→ whole: 8
4.7 = 1 + 6→ part: 1
5.5 = 1 + 4→ part: 4
6.6 = 2 + 4→ whole: 6
7.12 = 1 + 11→ part: 1
8.14 = 1 + 13→ part: 13
9.11 = 5 + 6→ whole: 11
10.11 = 1 + 10→ part: 1
11.14 = 3 + 11→ part: 11
12.15 = 3 + 12→ whole: 15
13.9 = 2 + 7→ part: 2
14.10 = 4 + 6→ part: 6
15.19 = 3 + 16→ whole: 19
16.17 = 2 + 15→ part: 2
17.19 = 1 + 18→ part: 18
18.15 = 7 + 8→ whole: 15
19.20 = 9 + 11→ part: 9
20.18 = 7 + 11→ part: 11
Twenty focused number bonds
The worksheet balances missing wholes and missing parts across twenty unique bonds. Questions move from familiar bonds within 10 to varied decompositions within 20.
Write one number in each empty node, then use the optional answer key to compare the complete bonds.
