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• Mental addition • • • • • • •

REMEMBER REMEMBER
0 0 0
0 I] III
EJ
0 I] = I mm nm = I
0 III D
EJ 0 El
El EJ
III 0
EJ
8+7=15 = 10+5 60 + 50 = 110 100 + 10
IT] Write these in the some way. [I] Now write these.
a 7+ 7 = b 9+6 = a 60+ 70 = b 90+80 =
c 9+4 = d 5+8 = c 50+60 = d 50+ 70 =
e 8+8 = f 9+8 = e 90+20 = f 80+50 =

-..
This number balance shows This number balance shows
the some information. the some information.
CHALLENGE
@] Design 2 number balances m Design 2 number balances
for each of these. for each of these.
• By adding number neighbours together,
you can make 20 totals which ore even numbers.
• Find as many of these as you can.

rn [gJ rn

a 7+7= 10+4 a 60 + 70 = 100 + 30 Open: design two 5 + 6 = 11, 6 + 7 = 13, 7 + 8 = 15, 8 + q = 17, 5 + 6 + 7 = 18,
number balances for
b q+6= 10+5 b qO + 80 = 100 + 70 2 + 3 = 5, 3 + 4 = 7, 2 + 3 + 4 = q q + 10 = 1 q
each of 11, 12, 18
c q+4= 10+3 c 50 + 60 = 100 + 10 Challenge
d 5+8= 10+3 d 50 + 70 = 100 + 20
1 + 2 + 3 = 6, 3 + 4 + 5 = 12, 5 + 6 + 7 = 18, 7 + 8 + q = 24,
e 8+8= 10+6 e qO + 20 = 100 + 10 Open: design two 1 + 2 + 3 + 4 = 10, 2 + 3 + 4 + 5 = 14, 3 + 4 + 5 + 6 = 18, 4 + 5 + 6 + 7 = 22,
number balances for 5 + 6 + 7 + 8 = 26, 6 + 7 + 8 + q = 30, 7 + 8 + q + 10 = 34,
f q+8= 10+7 f 80 + 50 = 100 + 30
each of 140, 150, 2 + 3 + 4 + 5 + 6 = 20, 4 + 5 + 6 + 7 + 8 = 30, 6 + 7 + 8 + q + 10 = 40,
160, 180 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28, 3 + 4 + 5 + 6 + 7 + 8 + q = 42,
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 36, 2 + 3 + 4 + 5 + 6 + 7 + 8 + q = 44,
3 + 4 + 5 + 6 + 7 + 8 + q + 10 = 52, 2 + 3 + 4 + 5 + 6 + 7 + 8 + q + 10 = 54