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diff --git a/tutorial/task9-solution1.mu b/tutorial/task9-solution1.mu
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+fn to-km miles: float -> _/xmm1: float {
+  var result/xmm1: float <- copy miles
+  var factor/xmm0: float <- rational 0x649, 0x3e8  # 1.609 = 1609/1000 in hex
+  result <- multiply factor
+  return result
+}
+
+fn test-to-km {
+  # 0 miles = 0 km
+  var zero: float  # Mu implicitly initializes variables in memory to 0
+  var result/xmm1: float <- to-km zero
+  compare result, zero
+  {
+    break-if-=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 0 miles = 0 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+  # 1 mile = 1.609 km approximately
+  var one/eax: int <- copy 1
+  var one-float/xmm0: float <- convert one
+  result <- to-km one-float
+  var lower-bound/xmm0: float <- rational 0x649, 0x3e8  # 1609/1000 in hex
+  {
+    compare result, lower-bound
+    break-if-float>=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 1 mile > 1.609 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+  var upper-bound/xmm0: float <- rational 0x64a, 0x3e8  # 1610/1000 in hex
+  {
+    compare result, upper-bound
+    break-if-float<=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 1 mile < 1.610 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+  # 2 miles = 3.218 km approximately
+  var two/eax: int <- copy 2
+  var two-float/xmm0: float <- convert two
+  result <- to-km two-float
+  var lower-bound/xmm0: float <- rational 0xc92, 0x3e8  # 3218/1000 in hex
+  {
+    compare result, lower-bound
+    break-if-float>=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 2 miles > 3.218 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+  var upper-bound/xmm0: float <- rational 0xc93, 0x3e8  # 3219/1000 in hex
+  {
+    compare result, upper-bound
+    break-if-float<=
+    draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, "F - 2 miles < 3.219 km\n", 3/fg 0/bg
+    count-test-failure
+  }
+}
+
+fn main {
+}