Number bonds!

21

Posted by Miss Chuch | Posted in Uncategorized | Posted on 12-10-2016

We’ve been so busy in Maths this week! Who can share some number bonds?

Can you write addition and subtraction facts using your number bonds?

For example,

3 + 7 = 10 so 10 – 7 = 3

11 + 9 = 20 so 20 – 9 = 11

40 + 60 = 100 so 100 – 60 = 40

Share your number facts below.

Miss Marks

Comments (21)

I know a few

80+20=100 so 100-80=20 and 100-20=80

15+5=20 so 20-15=5 and 20-5=15

6+4=10 so 10-6=4 and 10-4=6

Excellent! What about this one…

100 = 25 + ____

100=25+75 so 100-75=25 and 100-25=75
100=15+85 so 100-85 =15 and 100-15=85
100= 5+95 so 100-95=5 and 100-5=95
100= 45+55 so 100-55=45 and 100-45=55

10-7=3
10-3=7

Well done, what about…

100 = ___ + 30

6+4=10 so 10-4=6
16+4=20 so 20-4=16
19+1=20 so 20-1=19
18+2=20 so 20-2=18
These are some I’ve remembered from this week!

Perfect! What about..

20 = __ + 12

20=8+12

1+9=10 so 10+90=100 and 100-10=90
2+8=10 so 20+80=100 and 100-20=80
3+7=10 so 30+70=100 and 100-30=70
4+6=10 so 40+60=100 and 100-40=60

10+0=10 so 100+0=100 and 100-0=100
1+9=10 so 10+90=100 and 100-10=90
2+8=10 so 20+80=100 and 100-20=80
3+7=10 so 30+70=100 and 100-30=70
4+6=10 so 40+60=100 and 100-40=60
5+5=10 so 50+50=100 and 100-50=50
6+4=10 so 60+40=100 and 100-60=40
7+3=10 so 70+30=100 and 100-70=30
8+2=10 so 80+20=100 and 100-80=20
9+1=10 so 90+10=100 and 100-90=10

1+9=10
4+6=10

1+9=10 so 10-9=1 and 10-1=9
90+10=100 so 100-90=10 and =100-10=90

6+4=10 so 10-4=6
18+18=36 so 36-18=18
50+50=100 so 100-50=50
6+6=12 so 12-6=6
80+5=85 so 85-5=80
70+30=100 so 100-30=70
20+80=100 so 100-80=20
5+5=10 so 10-5=5
4+4=8 so 8-4=4
8+8=16 so 16-8=8
15+15=30 so 30-15=15
16+16=32 so 32-16=16
17+17=34 so 34-17=17
19+19=38 so 38-19=19
20+20=40 so 40-20=20
21+21= 42 SO 42-21=42
22+22=44 SO 44-22=22
23+23=46 SO 46-23=23
24+24=48 SO 48-24=24
25+25=50 SO 50-25=25
52+52=120 SO 120 -52=52
54+54=130 SO 130 -54=54
56+56=140 SO 140-56=56

1-1+27=27
2-2+28=28
3-1+10=12
10+31=41
100+3000=3100
1000-104=906
1010+1010=2020
1900+21=1921

I know a few
21+7=28
25-7=18

I know a few
27-21=6
21+7=28

I can do some
10-2=8
187-187=0

57+57=142 so 142-57=57
58+58=144 so 144-58=58
59+59=146 so 146-59=59
60+60=148 so 148-60=60
61+61=150 so 150-61=61
62+62=152 so 152-62=62
63+63=154 so 154-63=63
64+64=156 so 156-64=64
65+65=158 so 158-65=65
66+66= 160 so 160-66=66
67+67= 162 so 162-67=67
68+68= 164 so 164-68=68
69+69=166 so 166-69=69
70+70=168 so 168-70=70
71+71=170 so 170-71=71
72+72= 172 so 172+72=72

78+78=156 so 156-78=78
60+60=120 so 120-60=60
89+89=178 so 178-89=89
90+90 180 so 180-90=90
Mums challenge
57+57=114 so 114-57=57
Rowan’s challenge
97+97=194 so 194-97=97
Dads challenge
37+37=74 so 74 – 37= 37

Wow! You’ve been very busy, Brodie! Well done.

99+99=198 so 198-99=99
67+67=134 so 134-67=67
38+

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