6. In the following tables, can you figure out the number sentences and fill in the gaps? For example, in table A: 1 ×


= 3, 2 × A ×


13 26 3


412 5 6


B –


100 89 90 80 69 70 60 50 39


= 6 C ÷


10 2 20 30 40 8 50 10 60


7. Karen thought of a number, subtracted 27 from it and was left with 62. What was the number?


8. Lee thought of a number, divided it by 8 and his answer was 65. What was the number?


9. Anne had 47 cards after her friend gave her 13 cards. How many had she at first?


Make Word Problems from Number Sentences 1. Invent stories for the following number sentences. a) 72 – 12 =


How many has he left?)


b) 21 + 7 = e) 81 ÷


= 9 Solve Equations


A number sentence with an equal sign (=) is called an equation. We must equate or equalise the numbers on both sides of the equal sign. For example, 5 + 9 =


. To solve this, we simply add the numbers, giving the answer 14.


c) 9 × 14 = f)


× 6 = 66


d) g)


– 10 = 139 + 2 = 31


(e.g. Dylan had 72 marbles but lost 12 of them in a game.


50 Equations


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