Page 40 - steps 3b.pdf

41
• Moving bracl(ets • • • • • • • Number displays . • • Iil L----------l
~:t.l.]GlkI'~ ~;~~]t4I;~
PAGE 70 OJ a (12 - 5) - 3 = REMEMBER Use only the arrowed keys
b 12 - (5 - 3) = on your calculator.
b (14-7)-2= liP-
rn 0 14-(7-2)= . ~.

@] a (15 - 8) - 1 = : :
b 1 5 - (8 - 1) = , Do you think this will
b 20 - (10 - 10) = r have the same answer?
P!fJ
II] a (20 ~ 10) ~ 100 1(1 0 - 6) - 4 1
~ OJ Try to make all the
numbers from 1 to 20
as your answers
[I] a (12 - 5) + 3 = to calculations.
b 12 - (5 + 3) = For example:
[]] a 110 - (60 + 40) = [I] a 10 + (5 - 4) = [[)II[±]EI r"
b (110 - 60) + 40 = b (10 + 5) - 4 = 1·1'
@] a (120 - 40) + 30 = [I] a 20 - (7 + 5) = [[)D[[)lIw Ei I 1.1
b 120 - (40 + 30) = b (20 - 7) + 5 =

Find as man y ways as you can
CHALLENGE to make the a nswer of 9 correct. CHALLENGE Challenge
Use numbers up to 20 .~
to go in the empty boxes. Use these numbers and signs as often as you like. Many possibilities, for
-
30 70 + - example:
rn [g] 17-([ H j)=9 Try to make answers of 10, 20, 30, 40, 50 .. up to 200. 70 - 30 - 30 == 10
30 + 30 + 30 - 70 = 20
a 4 a q
Pm !STEPS 3b:2S! I STEPS 3b:2SI 30 + 30 - 30 = 30
b 10 b 5 70-30 = 40
30+30+30+30-70 = 50
30+30 = 60
00 ~ [§J [ID Challenge rn 70+ 70-70 = 70
Use numbers up to 20 70 + 70 - 30 - 30 = 80
a 6 a 0 a 10 a 10 Many possibilities, for 30 + 30 + 30 = qO
b ~O to complete: example:
b 8 b 20 b 4 70 +30 = 100
17 - (0-0) = q. 5-4=1 5+3+3= 11 70 + 70 - 30 = 110
rn 00 ~ Find as many ways as 5+4-3-3=3 5+4+3= 12 30 + 30 + 30 + 30 = 120
5 - 3 = 2
5+4+4= 13
70 + 30 - 30 = 130
possible. (1/3 b)
a 11 a 110 a 8 5+5-3-3=4 5+5+4= 14 70 + 70 = 140
4+3+3-5 = 5 5+5+5= 15 30 + 30 + 30 + 30 + 30 = 150
b 11 b 50 b 18
3+3=6 5+5+3+3= 16 70+30+30+30 = 160
5+5-3=7 5+5+4+3= 17 70 + 70 + 30 = 170
4+4=8 5+5+4+4= 18 70 + 70 + 70-30 = 180
5+4=q 5+5+5+4= 1q 70+30+30+30+30 = 1qO
5+5= 10 5 + 5 + 5 + 5 = 20 70 + 70 +30 +30 = 200