#### Number of problems found: 103 Add and write the result again as hours, minutes, seconds: 2hodiny45min15s + 1h20m50s =
• Length subtracting Express in mm: 5 3/10 cm - 2/5 mm
• Opposite numbers Calculate opposite numbers (additive inverse) to given ones:
• Which Which decimals when subtracted equal 3.89: a - b = 3.89
• Operations Sum of the numbers 1.01 and 3.35 multiply by the difference of numbers 6.69 and 1.39. What is 4 1/2+2/7-213/14?
• Evaluate expression If x=2, y=-5 and z=3 what is the value of x-2y
• Identity 123456789 = 100 Use only three plus or minus characters to correct previous identity/equation.
• Airport On blue airport are 23 aircraft, flew 7 aircraft, the arrival 9 aircraft. How many planes were a blue airport tonight?
• Expression 6 Evaluate expression: -6-2(4-8)-9
• Brackets 2 Add parenthesis to make true: 5-2×6-4+2=5
• With bracket Calculate (evaluate) simple mathematical expression with a negative numbers and a bracket: 13+15*5-2*(-6)
• Saving money Marko saved € 64. Milan saved 8 euros less than Marko. Marika saved 6 times more than Milan. Calculate who saved how much.
• Brother and sister When I was 8, my sister was 4, and now I am 18. How old is my sister? The whole loaded train weighs 360 tons. It has twenty wagons, each carrying 12 tons of grain. What is the weight of the locomotive?
• Mistake Nicol mistake when calculate in school. Instead of add number 20 subtract it. What is the difference between the result and the right result?
• Product of the sum and difference Calculate the product of the sum and difference of numbers -7 and -2.
• Pizza fractions Ann ate a third of a pizza and then another quater. Total part of pizza eaten by Ann and how much pizza is left?
• Brackets Place one pair of brackets in expression 20-16 + 10 - 4 - 2 so that the result will be 0.
• Two equations Solve equations (use adding and subtracting of linear equations): -4x+11y=5 6x-11y=-5

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