Endless Math Sheets

Number Bonds to 100 Worksheets

Number bonds to 100 start with multiples of 10 (30 + 70) in Year 2 and move on to any pair (37 + 63) in Year 3. Choose the type of pairs in the options.

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Sheet code N0CKO9
NameDate

Number Bonds to 100

Score / 20

Fill in the missing number.

1.100−70=
2.100−10=
3.40+=100
4.90+=100
5.100−60=
6.20+=100
7.100=100+
8.60+=100
9.100−50=
10.100+=100
11.100−90=
12.100−100=
13.0+=100
14.100=70+
15.+100=100
16.100−80=
17.+60=100
18.+30=100
19.100=30+
20.+70=100
endlessmathsheets.comSheet N0CKO9 · Page 1 of 2
NameDate

Number Bonds to 100

Score / 10

Fill in the missing number.

21.10+=100
22.+40=100
23.100=80+
24.100−0=
25.100−20=
26.+0=100
27.100=10+
28.+20=100
29.100=0+
30.100−40=
endlessmathsheets.comSheet N0CKO9 · Page 2 of 2

Answer keyNumber Bonds to 100

Fill in the missing number.

1.100−70=30
2.100−10=90
3.40+60=100
4.90+10=100
5.100−60=40
6.20+80=100
7.100=100+0
8.60+40=100
9.100−50=50
10.100+0=100
11.100−90=10
12.100−100=0
13.0+100=100
14.100=70+30
15.0+100=100
16.100−80=20
17.40+60=100
18.70+30=100
19.100=30+70
20.30+70=100
endlessmathsheets.comSheet N0CKO9 · Page 1 of 2

Answer keyNumber Bonds to 100

Fill in the missing number.

21.10+90=100
22.60+40=100
23.100=80+20
24.100−0=100
25.100−20=80
26.100+0=100
27.100=10+90
28.80+20=100
29.100=0+100
30.100−40=60
endlessmathsheets.comSheet N0CKO9 · Page 2 of 2

What's on this worksheet

Pairs that make 100. Choose multiples of 10, multiples of 5, or any whole numbers. Each sheet comes with an answer key on a separate page.

Teaching tips

  • Use known bonds to 10: 3 + 7 = 10, so 30 + 70 = 100.
  • For any pair, make the next ten first, then count on in tens: 37 + 3 = 40, then 40 + 60 = 100.

How to use this worksheet maker

Press New worksheet for a fresh set of problems, then Print. To save a PDF instead, choose "Save as PDF" in the print window. Every sheet has a short code in the bottom corner. Copy the link to a sheet and you can print exactly the same problems again later, which is handy for retakes and for sharing with other teachers.

National Curriculum: Year 2: derive and use related facts up to 100, such as 30 + 70 = 100.

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