Remember:
Subtraction is the reverse of addition, e.g. $14 - 9$ means ‘what number gives $14$ when added to $9$?’ The answer is $5$ because $9 + 5 = 14$.
$4 - 2=?$
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$2$
$5 - 2=?$
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$3$
$5 - 3=?$
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$2$
$6 - 2=?$
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$4$
$6 - 4=?$
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$2$
$7 - 2=?$
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$5$
$7 - 5=?$
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$2$
$8 - 2=?$
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$6$
$8 - 6=?$
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$2$
$9 - 2=?$
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$7$
$9 - 7=?$
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$2$
$10 - 2=?$
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$8$
$10 - 8=?$
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$2$
$11 - 2=?$
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$9$
$11 - 9=?$
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$2$
$6 - 3=?$
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$3$
$7 - 3=?$
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$4$
$7 - 4=?$
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$3$
$8 - 3=?$
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$5$
$8 - 5=?$
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$3$
$9 - 3=?$
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$6$
$9 - 6=?$
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$3$
$10 - 3=?$
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$7$
$10 - 7=?$
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$3$
$11 - 3=?$
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$8$
$11 - 8=?$
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$3$
$12 - 3=?$
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$9$
$12 - 9=?$
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$3$
$8 - 4=?$
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$4$
$9 - 4=?$
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$5$
$9 - 5=?$
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$4$
$10 - 4=?$
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$6$
$10 - 6=?$
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$4$
$11 - 4=?$
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$7$
$11 - 7=?$
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$4$
$12 - 4=?$
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$8$
$12 - 8=?$
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$4$
$13 - 4=?$
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$9$
$13 - 9=?$
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$4$
$10 - 5=?$
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$5$
$11 - 5=?$
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$6$
$11 - 6=?$
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$5$
$12 - 5=?$
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$7$
$12 - 7=?$
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$5$
$13 - 5=?$
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$8$
$13 - 8=?$
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$5$
$14 - 5=?$
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$9$
$14 - 9=?$
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$5$
$12 - 6=?$
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$6$
$13 - 6=?$
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$7$
$13 - 7=?$
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$6$
$14 - 6=?$
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$8$
$14 - 8=?$
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$6$
$15 - 6=?$
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$9$
$15 - 9=?$
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$6$
$14 - 7=?$
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$7$
$15 - 7=?$
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$8$
$15 - 8=?$
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$7$
$16 - 7=?$
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$9$
$16 - 9=?$
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$7$
$16 - 8=?$
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$8$
$17 - 8=?$
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$9$
$17 - 9=?$
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$8$
$18 - 9=?$
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$9$