Open Middle®
Directions: Using the digits 0 to 9, at most one time each, place a digit in each box to make the equation true.
Hint
What’s your best first move? Does it make more sense to start with the addition or subtraction?
What’s the greatest value you can find? What about the smallest value?
What’s the greatest value you can find? What about the smallest value?
Answer
There are multiple answers including:
78-19=24+35
97-28=13+56
98-15=47+36
78-19=24+35
97-28=13+56
98-15=47+36
Source: Brian Errey
90-40=50+0
using 0 more than once….is that allowed in this problem?
80-10=60+10
using 0 more than once….is that allowed in this problem?
You can only use 0 one time.
55-12=43+0
51+32=83-0
21+11=32+0
60-40=10+10
60-10=25+25
9-3=3+3
90-30=30+30
55-12=43+0
52-41=3+8
78-40=23+15
70-50=50+40
19-78=35+24
your answer to the subtraction is negative while your answer to the addition is positive
30+30= 50=10
It is suppose to be 30+30 = 50+10
It is cause it is 30+30=50+10
30-20=1+9
93-13=44+36
19+12=43-12
87-23=49+15
09-01=01+07
45-20=16+9
45-20=9+16
90-80=10+9
50-25=17+8
My answer is 89- 76=13+00
My answer is 89- 76=13+00 this is my answer
99-45=45+45
60 – 10 = 25 + 25
32-10=11+11
98-32=54+10
89-14=63+12
78-54=01+23
96 – 32 = 64
50 + 14 =64
68-36=12+20
35 + 45 = 80 + 10
90-40 = 25+25
9-3 = 5 + 1
60-20=10+30
78-40=23+15
98-32=56+10
89-14=63+12
98-10=63+25
98 – 74 = 23 + 01
98-10=63+25
Hi, I´m a teacher. This website is so cool 🙂
98 – 52=36 +10 (Ivy)
69 – 08 = 24 + 37 (Ali)
97 – 06 = 73 +18 (Mrs Hamer)
80 – 36 = 19 + 25 (Luka)
98 – 16 = 50 + 32 (Aadarsh)
85 – 14 = 69 + 02 (Bayrin)
89 – 13 = 26 + 50 (Ivy)
I agree that, as written, using zero repeatedly is not allowed. However, allowing just zero to be used more than once might be a nice way for some kids to gain access. Then you could remove that allowance as a constraint to push kids’ thinking…
98-15=63+20
98 -65 = 23 + 10
Ms Smith & Harper M.
76-54=19+03
90-25=17+48
2nd Graders at Barkley Bridge Elementary