Math of my first 2 practice Forex trades

Canadian trade calculations when the graph was spiraling up: BUY trade on USD/CAD

$300,000 (USD) x 1.14360 = $343,080 (CAD)

$343,080 (CAD) / 1.13960 (-40 pips) = $301,053.00 (USD)

$300,000 (USD) - $301,053 (USD) = -$1,053 (USD)

$343,080 (CAD) / 1.15560 (+120 pips) = $296,884.7352 (USD)

$300,000 (USD) - $296,884.74 (USD) = $3,115.26 (USD)

$3,115.26 / $1,053 = 2.958x

Margin was $6000 (50:1)

New Zealand trade calculations when the graph was spiraling down: SELL trade on NZD/USD:

-$301,000 (NZD) x 0.76288 = -$229,626.88 (USD)

-$229,626.88 (USD) / 0.76688 (+40 pips) = -$299,430.00 (NZD)

-$301,000 (NZD) + $299,430 (NZD) = -$1570 (NZD)

-$1570 (NZD) x 0.76688 = -$1204.00 (USD)

-$229,626.88 (USD) / 0.75088 (-120 pips) = -$305,810.36 (NZD)

-$301,000 (NZD) + $305,810.36 (NZD) = +$4,810.36 (NZD)

+$4,810.36 (NZD) x 0.75088 = $3612.00 (USD)

$3612 / $1204 = 3.0

Margin was $4,592.54 ($229,626.88 (USD) / 50)

I lost both trades because the direction reversed on me immediately.